Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d165a8595b527d2…

MALICIOUS

PDF

62.5 KB Created: 2021-05-20 21:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a60559ee97f52bf15e84fa174641b82 SHA-1: 46fe6f1158642bd8b2b0f981560bdf799594d943 SHA-256: 0d165a8595b527d280f30e1031f17b0b69ac015c9bd423283a0010d4a6c84d60
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 high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a tactic of using seemingly legitimate content to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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=ancient+greece+reading+comprehension+pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4e3ba4df9887d7137683ea94dae36a60/81012849732.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160702e1d89e8a---rumadobaraxenozivipad.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609758aaecb82---82675339904.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32eb5c085a---fojak.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878884ecd70---86222747089.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lihl2njr90tamhf76h3638h5p0/dofefure.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mfibpbgn81tq1367d52a1530rv/90202251990.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xabowiferefi.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091682b1f3fc---sufuvafulowogiz.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7855a24cd---gorevek.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/feec31d792792d2694844f396c07d2b6/31335934563.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mae94jf5p7qqpi95dpujirsonj/80523400477.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160980b3dc7190---93162059158.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089020a57a31---5002946943.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f173132a---jekufitavakemukola.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_off0000d652.bin
d5be6d7dd5a33c8762726b3998832ca948feb713f9f4ba5f71369240b92f8f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 5528 bytes

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