Malicious PDF — malware analysis report

Static analysis result for SHA-256 17dfb20b8682394e…

MALICIOUS

PDF

89.6 KB Created: 2021-06-22 09:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95e2a1e7a9c0378fc12cfe08f75ba0d7 SHA-1: 0b58a98eb2d7b46c3a71a2255526f8508a00d1d1 SHA-256: 17dfb20b8682394e5592e6ce58dfcc0e080551534c5e03389653d8fff77a1311
154 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating an attempt to redirect users to malicious sites. The PDF's structure and embedded links suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8245

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://lacecinella.com/writable/public/userfiles/file/sosusimolemefenukavoxi.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/dd040f420f322f885e4339d405cf3de4/43788821599.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/vd0as2pksstqlbri16fv702ino/59461916021.pdf
    • http://nitexprofi.cz/userfiles/file/58926740555.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acf7a0a06d4---ferodoromasepusog.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075704b386b9---zofuzifawoborijajugupis.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b12fe5640c97d9c6edbfeba5dd6f82a9/61323592043.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a0f172b2ae99dd1d8229117c5fef2638/23924053625.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b32be04e52c---riruweregumosup.pdf
    • https://harrisitalia.it/uploads/file/zofivuwapiravojelezilek.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d30ed436---87995842152.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6cc9b7f76b6492a260a2defb9d6b5fbf/nisatovovudaxepifofususa.pdf
    • http://andlupa.com/userfiles/file/7584331252.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/21fbdb9577351e90a7d8d6edb5193f03/51326602194.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1516c6475a6b9d7ccfc2da2dbf836406/11295529157.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7mb2emp1qum31k50laenf6shnt/tupaxodojeludafofirux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=katana+and+gun
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cf0.bin
56037558aa96f16008931add20ac60e43b86401ccdf60c448bebe7c20a8259ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF0 4260 bytes

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