Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f1a80011fa6576…

MALICIOUS

PDF

76.9 KB Created: 2021-06-07 05:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3e3faca82561b6e92a4e48b05c4d189c SHA-1: 28d2de06f0340286188b08a6a842e0093b0cb65b SHA-256: 87f1a80011fa657671a1dd9678edd5b6a8d746e45c8a7ec1b0cba5295bd6ac52
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The presence of embedded URLs and the overall structure suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

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://catamma.ru/uplcv?utm_term=watson-glaser+critical+thinking+appraisal+iii+test PDF link annotation
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8a69ede8bae00b9786b0a89de2042462/72677463376.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/dexilusedoxawixegez.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/94565932261.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/244983731540ae6caedb10f591376bc7/xeparugozuvuruper.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2e8340c7---ximasefipavolezonuxodirem.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/26098650689.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f101e48519---zewasuxita.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087d07904b5f---bubibilugoriteraxo.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gedop.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/qigvv5i188pvq8itcfdousvgd2/70457981902.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/00ee5344d070dfe78405f3f0e2ed3fa0/76619241705.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/hsebhutikjmuovfjdv2ak1fbe4/68478786237.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/8112280931.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3948f3aa3---pozuvugudabumojog.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0653d32f75---muwobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 5092 bytes
SHA-256: 795403ddd8e816952fd98c3ff4a4f02bd33f88a2b48bc4955374be8157fd012b

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