Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd622d828ec0a56c…

MALICIOUS

PDF

64.0 KB Created: 2021-05-16 17:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ac9dc3aac7ee3e8a1e155e1dc530dc5 SHA-1: db8ddd6369b407da3879793e33eb593e473a2518 SHA-256: fd622d828ec0a56c4b3e116f3ccb0a9d58c518e7c76934c732c3cd4a02cbcab4
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 distribution attempt. It contains a link farm pointing to various compromised CMS upload directories, suggesting it's part of a larger campaign to distribute malicious files. The document body, though heavily obfuscated, appears to be a lure for free templates, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/2r8j80jt52f96h7t495fs3cgjh/nebuduvuxezozexi.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076184395855---rujisawamogesafuz.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160952c2ee3950---dixatubufu.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5d70efaecf228ee041c352babf4e4e85/tipudomejibize.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58b57eb1f---49865509282.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/06763f4234b0f4e4e6075d2dd9e4f40b/59627013039.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734d7a507aa---59098683164.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac32a0724---36606707334.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4d80279adf83bba6132116222cd27ebc/tebeviwofodefodidifaf.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083b504c1f50---88536456827.pdf
    • https://xo-sound.ru/userfiles/file/26275220663.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/558495ef77d119fbc38d69fec6091ed2/velevudazufin.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b549d67bc---15274644819.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/b8d312abb12a918eb44cb53331df25fd/viralowajakozobi.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a106bd15395---10457556698.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896864d8378---baxusenukazupodusuf.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094ebad83200---24179112902.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086e360bb83d---fisoxujejonexagumavuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free++template+joomla+3.+5
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfb.bin
309bfa29d22138d378b85e1611f3cd53daaea06f4e48d1c048af403d42811e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 5136 bytes

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