There are a lot of advantages in using PDF documents; the ability to secure the PDF file with the help of a password is one of the main advantages. You can restrict other users to edit, duplicating, printing or accessing these files. But if you forgot PDF password then you will not be able to access these files. Luckily there are a few software available on the Internet that can easily solve this problem by cracking these password-protected PDF files for you. Below listed are four such software that you can use to crack PDF password easily and efficiently.
This software is a fast password cracking tool and is developed by Open Wall. It was initially developed for Linux but later it is made available for other operating systems. It combines several password crackers in one package, auto detects password hash types and also includes a customizable cracking engine. To be specific, it is a dictionary-based password cracking tool and supports almost all the current PDF encryption algorithms.
Step 1. Download and install the latest jumbo edition of John the Ripper from the custom builds page. We will use compiled version for Linux in this section.
Step 2. Download this pdf2john.pl perl script to extract password hash from locked PDF file first. Once installed, use the following command to generate a hash file:
./pdf2john.pl aaaa.pdf > pdf.hash
Step 3. After getting hash file, John the Ripper will start cracking PDF password using the default wordlist:
/john Desktop/crackpdf.hash ?Cwordlist wordlists.txt
Step 4. That's it you are done. Let the program run in the background as it will take some time to recover the password. The more complex the password, the more time it will take to complete the task.
John The ripper is no doubt a good software when it comes to crack your PDF password but it takes a lot of time to deliver the result. The speed drastically reduces if you are using an old computer.
iSeePassword Dr.PDF is another software that not only crack PDF password but also unlock PDF protections for editing, copying, and printing restrictions instantly. It cracks PDF password with three configurable attacks which are Brute force attack, Brute Force with Mask Attack and Dictionary attack. It also has a batch removal function so that you can upload multiple PDF locked documents at one go. It also saves the running project at an interval of 5 minutes so that you can continue your last searching history when the program is closed. To use this software to crack PDF password, please follow the steps below.
Step 1. Preparation
Download and install the software on your computer. After installation, launch the program and you will see the main interface of the software. It will offer you two functions/options. "Recover Open Password from PDF" and "Remove Owner Password from PDF".
Step 2. Load PDF File from Computer
First let consider the first function "Remove Open Password from PDF". Upon selecting this feature you have to click on the "Add File" tab to import the password-protected (encrypted) PDF document.
Step 3. Password Cracking Settings
Now you have to select the attack type from dictionary attack, brute force attack and mask attack. Select the one that suits your needs. Here we have choosen Mask Attack type. Now select the "Settings" tab corresponding to the attack type that you choose followed by inputting some password information like length, small or capital letter, etc to accelerate the recovery process.
Dictionary Attack: The user provides a dictionary file and then import it on to the software. The software automatically searches the password from the dictionary file.
Brute Force attack: This method tries all the possible combinations in a password. This might take a long time if you cannot provide any information about your password.
Mask Attack: This is the most advanced cracking method of this software. If you can provide any hint about the password like length, number, capital or small letter then this method can crack your PDF password instantly.
Step 4. Start Cracking PDF Password
After you have picked up a password cracking method you can go to the "Settings" and select the GPU acceleration according to your systems configuration. It drastically improves the recovery process up to 10X. this software supports Multi-Core CPU processing apart from GPU acceleration. So set the value according to your system specification.
Now its time to recover PDF password. Click on the "Start" tab to begin the recovery process. Once the process is completed, the password will be displayed in the pop-up dialogue box.
iSeePassword Dr.PDF is one of the most popular and trusted software out there when it comes to crack PDF password. It has got a smooth interface and does its job instantly. It supports both Windows and Mac operating systems.
GuaPDF is another lightweight but powerful software that can crack PDF password with almost all kinds of encryptions. It is fast and supports GPU acceleration. It also supports protected PDF file created by Adobe Acrobat Pro X.
Step 1. Download GuaPDF password cracking software and install it on a Windows computer. After installation, run the software as administrator.
Step 2. Click on the "file" icon from the menu bar. Now click on the "Open" tab and choose a locked PDF documen to start the process of cracking PDF document. It will take a few minutes to unlock the PDF.
Step 3. That's it you are done. After the process is completed simply open the PDF document and it will no longer ask for a password.
This software is free and takes very little space on your hard disk. It is user friendly and works on both 64 and 32-bit operating systems. In addition, it works on Linux, Windows, and Mac.
Emegered online service is the latest trend for cracking password from PDF files. This type of tool is a cloud-based solution to crack PDF password. Onlinehashcrack.com is a website that is very secure as it doesn't store any files. After the job is done the uploaded files are removed from their server. The only drawback is this website only supports PDF files which are less than 200 MB.
Step 1. Open a browser and visit this webpage.
Step 2. Upload the password-protected PDF document by clicking on the "Browse" tab on the right side.
Input a valid email address to receive the unlocked PDF file and click "Submit" button to send the file to remote server. Now, you have to check out the mail box from time to time as the website will send you the unlocked PDF to target email. However, there is no guarantee for that. Usually, if you did not receive the email after two days, it means the website failed to crack PDF password.
This is a quick solution and it doesn't require any software download. You need a stable Internet connection for this tool to work. If you want to crack multiple passwords, you have to upload them one by one as the batch upload is not supported.
You can try any of the above-mentioned software to crack PDF password but if you are looking for a fast and reliable solution then go for iSeePassword Dr.PDF. It will crack all kinds of encryption so no matter how strong your password is, this software is able to deliver the result. It can recover PDF Owner password and Open password, which is a great feature and it uses three attacks to crack PDF password, making this software unique than its rivals.