Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cfa0f7e4b5539e…

MALICIOUS

PDF

59.4 KB Created: 2021-05-15 08:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b12b5c02e7c2d73b4138f95c02ba019e SHA-1: 2ff2daac6c85f96c2a972d2e329af4d28f38906d SHA-256: 05cfa0f7e4b5539e9a3ab8149243f48d3f8992bc26d54f2e12476fe5bf2cd040
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9433

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://queure.ru/uplcv?utm_term=varicela+adultos+pdf+2018
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160939fae6664c---17781047028.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c534d21fb38e678532166e7011bd758/41205566780.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c31b1fec0---jijagurazowaw.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a8e765b7e1c89c0cb2f3e9762b86517/26988170391.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/disebemeto.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1c5dc394---7743176167.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0llnckc1puc57l60l6u62tucj0/dodifodusoregefepe.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19d02be62---25950562270.pdf
    • http://akcjonariusz.com/UserFiles/file/207638328.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609af2ca51c11---sububit.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/n6plkkssob9fmjta0gtqi9p3js/pedolitufevufobafumofuk.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0666a726---73932137780.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075690ee73c2---toxeki.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160755d13b4549---lisonewamarimaditorirur.pdf
    • https://myphi.biz/nbloom/fckuploads/file/77694109795.pdf

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