Malicious PDF — malware analysis report

Static analysis result for SHA-256 663320177661c1f9…

MALICIOUS

PDF

37.9 KB Created: 2021-09-24 20:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 847b1f3eb0c7e8f6436d5c747b052b74 SHA-1: b0f49127b1b269f093241b53cc1288c139eaf394 SHA-256: 663320177661c1f9f1c0c3b68fd483dd29ffbf7ea4d0f40c22b47b4c411a5ff1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as a phishing lure due to its image-only nature and small file size, typical of a screenshot designed to hide clickable elements. It contains a link farm pointing to multiple compromised WordPress sites, which are likely hosting malicious payloads. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7966

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 http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad5c6d4b62---sovekulazevenumitume.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161467105b614b---mimasovinonozuboruxe.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/xojetoxavenazizuxuguda.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/setexulik.pdfIn PDF document text
    • http://vipdiler.ru/files/file/batidizumixizipukofado.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/wurapi.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/dudizamofine.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9c74ba29c---70449956351.pdfIn PDF document text
    • http://tianfonmm.com/d/files/33590206427.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/meh1ok9cbn9rafhcd9jn1f0jj1/51843855543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=farming+simulator+20+unlimited+moneyPDF link annotation

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