Malicious PDF — malware analysis report

Static analysis result for SHA-256 6838fb36656051b8…

MALICIOUS

PDF

37.9 KB Created: 2021-07-02 20:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb84e5a4cbc616372f5fa500f51beee4 SHA-1: 27de1981c9ab6f0eab1029b36f52003de028447e SHA-256: 6838fb36656051b89b2a25d42870f94d90aa5e58304b23ddeeed240a6085d536
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains numerous external links, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The document's structure, being image-heavy with minimal text, further supports its use as a deceptive tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7773

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://wastran.ru/uplcv?utm_term=the+owl+in+the+attic+and+other+perplexities PDF link annotation
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/7okuni9vjsbu4h5mpq4u1lsbjs/pufamodabudimoripogakubu.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7384076f495bebd6a69cd09ee4079c6a/junutorisijibaxige.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/67f1e4bec30614f3aa0d78fc05224584/pexurixifunexezim.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607307ee70b38---vufexu.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/3098380060.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/pitovoruwuzavoxunu.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/83703070324.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/407160b027f1d6733728bb2dd085a217/6433073970.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4no33jsd7e2mak3f05sopqs5ql/gugobizibazakogasa.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2aa7ca11c---talinezubuzali.pdfIn PDF document text

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