PDF malware analysis — malicious · 8d7e644f6d7a437d

MALICIOUS

PDF

37.5 KB Created: 2021-07-16 01:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: c07d4ca786180e283bdd8fc4d36fdb25 SHA-1: 3a4a3875423463f0e2bbb6e4eded98d2806427e6 SHA-256: 8d7e644f6d7a437d00f796ea83a0e7263a46623cac1efd92495d2a8319dc6c10

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as a malicious PDF by ML classifiers and ClamAV, employing an image-only lure to disguise clickable links. These links predominantly point to compromised WordPress upload directories and other disposable hosting, suggesting a phishing campaign designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent beyond the phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9646

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 37 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2da5469bfefe71dd874bff22dea24bf8/36047121955.pdf In PDF document text
- https://augsburger-dartliga.de/uploads/file/46501679112.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c971ec82---79528647943.pdfIn PDF document text
- http://kiuruvedenlukio.fi/tiedostot/file/20140220253.pdfIn PDF document text
- http://leguido.net/files/bulesopilodozazisep.pdfIn PDF document text
- http://bizbecho.com/pa/trainstation/uploads/image/file/40475782662.pdfIn PDF document text
- http://www.manorbymajor.com/userfiles/files/40504040822.pdfIn PDF document text
- http://www.vnos.vn/app/webroot/uploads/files/48181430653.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/adb494f918c74c16a7a3339aa8ca66a8/movubexabi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=icd+code+for+high+cholesterolPDF link annotation

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