Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a9558d880cfa13…

MALICIOUS

PDF

38.6 KB Created: 2021-08-15 07:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c39aa403d124afe029e40e97be634b9 SHA-1: 5fbf90688c98fff6d25f26e46f8c2707d7d0b5b1 SHA-256: a3a9558d880cfa134b1d530c15c5368dfcbe64625c50640be80cd256ffcaa9ad
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking a link. The embedded links point to compromised WordPress upload directories, suggesting a mechanism for delivering further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8432

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 38 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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160add278bdb1c---roxalomofelorola.pdf In PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160755ee52bb6d---zirubupab.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ecd9ba235---vopanuf.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/26d344e316aa4a8cfdcac5be80644bf9/winutanarutobev.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/70668289519.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b2dcd34ea4bbfb8005ba27d7531ffe3/5960829654.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/sakewagusigetafewo.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/purodejuwezuge.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bc4f3ec8fa282b83b3a320c5a0e42bdb/dutunafoboro.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/pogomupuk.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d7981854---nikugebujorekebaguzukenap.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/67082509100.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/93761968027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=byomkesh+o+agniban+%282017%29+bengali+movie+hdrip+downloadPDF link annotation

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