Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b3a664ce20ab99…

MALICIOUS

PDF

37.9 KB Created: 2021-06-21 08:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dbd50954ad361d97ad4c59fc57ce9e1d SHA-1: 1542f55072ec6cb5e38d62f580b8b06a7936350b SHA-256: 55b3a664ce20ab9917729335d244c4929f85f9bbb9c85e769f9b9e7805eca2f9
174 Risk Score

Malware Insights

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

This PDF document is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide a clickable link. The heuristics indicate a link farm pointing to compromised CMS upload storage, suggesting the document's primary purpose is to redirect users to malicious sites. No scripts were extracted, but the presence of multiple external URIs and the ClamAV detection strongly support a malicious phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6440

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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1f6o231jrol8cn9m7jlpcs6er5/22808255748.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb519de556---jitusimena.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/11720637396.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4e9c88e1204112af2c37035c031a0aab/84851781960.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160782a50c550a---lirubufozorupozi.pdfIn PDF document text
    • https://faprosid.com/file/mezij.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/lepujasixuzumuxagajida.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/872317d60602753900317b3e2fc1f035/nijosajinenoserufuk.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/giwudatesal.pdfIn PDF document text
    • https://andrejc.si/files/file/zugegigadalenigamadog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=trabalhe+4+horas+por+semana+epub+downloadPDF link annotation

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