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Create a file named index.html in the root of your local web server's directory.

add

: It takes that URL, visits it, and converts the webpage's contents into a downloadable PDF file. pdfy htb writeup upd

Browsing to the target IP on the assigned port reveals a small input box asking for a URL.

: If you attempt to pass http://127.0.0.1 or http://localhost , the application throws an error or triggers a generic validation block. This implies there is a basic blacklist or sanitization filter preventing the engine from calling internal network services directly. Create a file named index

The site allows uploading PDF files and converts them to PNG images.

The backend returns the newly generated PDF filename. When you open or view the document in the provided , you will see a text printout of the server’s /etc/passwd configuration file right on your screen. : If you attempt to pass http://127

[Attacker] ---> Post URL (Exploit Server) ---> [PDFy Web Server] | Follows 302 Redirect v [Attacker Flag] <--- Generates PDF <--- Reads file:///etc/passwd 🔍 Step 1: Initial Reconnaissance & Code Review

Official PDFy Discussion - Page 2 - Challenges - Hack The Box

(ALL) NOPASSWD: /usr/local/bin/pdf_convert.py