Cybercriminals are now using PDF attachments as a tool to launch sophisticated cyberattacks. These seemingly harmless files may contain hidden malicious links or QR codes, cleverly disguised using trusted platforms like Bing, LinkedIn, and Google AMP. Experts are urging users to exercise caution when opening unknown PDFs or scanning suspicious QR codes.
Did you know that simply clicking on a PDF file could expose you to a serious cyberattack? According to cybersecurity data:
22% of malicious email attachments are in PDF format.
68% of cyberattacks are carried out via email.
Although not a new tactic, these types of attacks have become more frequent and sophisticated in recent months.
Cybercriminals embed links to phishing websites or malware downloads inside PDF documents. These links are often disguised using:
Eye-catching images or text, encouraging users to click
Logos and branding of trusted companies like Amazon, DocuSign, or Adobe Acrobat
Once clicked, users are redirected to malicious websites or unknowingly download harmful software.
These attacks are hard to spot because:
Links, text, and images in the PDF can be easily altered or updated by attackers
Hackers use legitimate-looking URLs to bypass email security systems
The user has to click manually, making it a form of social engineering attack
Attackers use trusted domains like:
Bing redirect URLs
LinkedIn page links
Google AMP links
These domains are often considered safe by security tools, making it easier for harmful content to sneak through.
What You Can Do:
Never click on links in a PDF unless you're 100% sure of the source.
Hover over the link to inspect the actual URL before clicking.
Another rising threat is QR codes embedded within PDFs. These can:
Redirect you to dangerous websites when scanned
Bypass traditional antivirus or email filters
What You Can Do:
Verify the source of the QR code before scanning it with your smartphone.
✅ Do not open unknown or suspicious PDF attachments
✅ Avoid clicking on unverified links inside documents
✅ Never scan unfamiliar QR codes without checking their origin
✅ Be cautious when receiving unexpected emails, especially with attachments
✅ Keep your antivirus software and email security filters updated
Cybersecurity threats are evolving rapidly, and attackers are using everyday tools like PDFs to bypass traditional security measures. Always stay alert, verify before clicking, and educate others to do the same.
