Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d7c8569e932d59…

MALICIOUS

PDF

39.0 KB Created: 2021-09-03 05:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 74371a5ef52b44f6035c901804ae73b1 SHA-1: c7572e0c70f83752ee47820a3c215245c8cbd27e SHA-256: 60d7c8569e932d5902ccb2fc9d0a3aef120d70c00b7120cdca434961cd37b625
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous links to external PDFs hosted on compromised CMS upload directories, suggesting it is part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be image data, reinforcing the lure technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

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 39 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 http://skolicka.eu/foto/images/file/retifenijaniwafuposa.pdf In PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/80768387485.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/eb792d21d0f4dcac43f5611be77eb32f/pevedozezuguwoxixoj.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/perun.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/30025710630.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb35c30eb8---85279509861.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ddf956250a680edb5f331d5381c53002/majixuxogolubopopapu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/779c0381ab12cbb17d528a68d929fcc1/17466118196.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/85196ae09e65d63d9b94ece2ffacd148/49307893135.pdfIn PDF document text
    • https://negaratoto.com/contents//files/19362065331.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/nonipufadetavevukifizigur.pdfIn PDF document text
    • http://builderall.info/userfiles/file/45100956289.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bs4q9lkag98ppbe25shchnpumj/petozufurugodakakexu.pdfIn PDF document text
    • https://cargotavio.ru/files/file/55934578960.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331bf48f33---pulewoxekilusuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=preschool+drawing+worksheets+pdfPDF link annotation

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