Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9df8039a8997100…

MALICIOUS

PDF

57.1 KB Created: 2021-06-09 23:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fbdfbaac744d55fd9070f2aeaead7774 SHA-1: f61d1fe3299245d15a130264d39965cb2f5d574f SHA-256: f9df8039a899710041727618ee469ffc6ab15eab39c7f672dcc03d0333b8499c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. The embedded URLs and the nature of the heuristics suggest the document is part of a campaign to trick users into downloading malware, possibly disguised as an application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8808

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=yts+tv+series+apk PDF link annotation
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/21436682dc637a7c276dea5679ecdbda/56805465105.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af594d74db---43073493060.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1878fc6b1b---32756476739.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec40478e22---kulujinajeledubopa.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/73d75d6a842f5586e7bdbcd4d306a057/57487944617.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/87b4o9hgpmvfujg4tsbmngrmga/31567540131.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa463e344---fefaxo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa05489665a---xefokinetiputagixula.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e184c162---taresumebebixinetumoraxak.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ad6191ac---xepejixe.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087de229e98e---tejirejukuzili.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/16892923985.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/72995579202.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926c08e61fc---nadevumupeloduwanamon.pdfIn PDF document text

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