PDF Password Cracking Using Hashcat

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Today we are going learn how to crack the password of PDF file using Hashcat tool. 

Disclaimer: The articles provided on HackWithV is purely for informational and educational purpose only, and for those who are willing and curious to know & learn about Ethical Hacking, Security and Penetration Testing. Anytime the word "Hacking" that is used on this site shall be regarded as Ethical Hacking.

What is PDF?

  • PDF stands for the Portable Document Format, used to display documents in an electronic form independent of the software, hardware or operating system they are viewed on.

What is Hashcat?

  • Hashcat is the world’s fastest CPU-based password recovery tool.
  • Hashcat is the self-proclaimed world’s fastest CPU-based password recovery tool, Examples of hashcat supported hashing algorithms are Microsoft  LM Hashes, MD4, MD5, SHA-family, Unix Crypt formats, MySQL, Cisco PIX.

Practical:

  • Attacker: Kali Linux(OS), Hashcat(Tool), Wordlist.
  • Target: PDF(file)

 ls

  • Here we have pdf2john(hashextractor), sample.pdf(target PDF file), rockyou.txt(wordlist). Now lets extract the hashes of PDF file.
 ./pdf2john sample.pdf

  • The pdf2john has extracted the hashes of the PDF. Copy the hash in a file.
 cat hash.txt

  • Here the hash is saved in a file. Now check for pdf version and module number for hashcat.
  hashcat --help | grep pdf -i

 
 

  file sample.pdf


 
 

  • Here we got that the PDF is version 1.6, so the module number for the hashcat is 10500.
  • Now, its time for crack the password using hashcat using module number -m 10500, hash.txt file and rockyou.txt file.
  • The rockyou.txt file contains 14344394 password.
  • This hashcat cracked the password within 20sec.
 wc -l rockyou.txt

 hashcat -m 10500 hash.txt rockyou.txt



  • Here we got the password of PDF, now try open the pdf with this password.

Be Aware, Be Secure.

Thank You 🙏

 

I'm a Cyber Security professional with expertise in Network, Application, Endpoint, Cloud Security, DevOps, and IT Ops. I have experience in various industries and am well-versed in relevant regulations and standards. My goal is to provide exceptional security solutions that protect organizations from evolving threats, while also streamlining workflows and improving collaboration between development, operations, and security teams through DevOps and IT Ops practices.

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