Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d06080302b25a99…

MALICIOUS

PDF

63.7 KB Created: 2021-05-17 16:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df15926e81c99d20e5741ab6ae6cfc0e SHA-1: 13de520a3a43a889bbe08ab12df84f8289d1bb8d SHA-256: 4d06080302b25a99fa161f1c0c159ca2ddb7d3f4c79a19f6263ab1c29ed57caf
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites, likely serving as a lure to download further malicious content. The embedded URLs and the nature of the heuristics suggest an attempt to exploit users searching for specific content, such as sheet music, to redirect them to malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8349

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://archism.ru/uplcv?utm_term=chopin+funeral+march+sheet+music+free
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa2b2173e802e29a33034c27f31dc8b4/66788673509.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436c0cd3a9---janafarazidofuxesal.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402d594a29---6878161262.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bda0a0b6c---56501904343.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1475668a7---sozediketasobekigabu.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b7556093---zesine.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/dq8nb0gbv2c3t3snej7826dvo4/silufudodazevaj.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3d4d35e5---jokewobonofi.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc78753c38---80818295496.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098f62761ce8---wisuloduginumawejep.pdf
    • https://amrapalispot.com/userfiles/file/piwujote.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bff999ba0---65780550606.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb1d45b15---27806072725.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44a.bin
929cf1681ad5809db6491ab993c639034b8ba3c7c635834bdb6d6ddf1c31e9c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 5160 bytes

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