Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada90942a95450fa…

MALICIOUS

PDF

89.0 KB Created: 2021-05-02 00:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2f79885379f2c98dc31290082b0bcc58 SHA-1: 0cc5feab7b68765535a50151a766977c09164751 SHA-256: ada90942a95450fa43224fabec047dbe6a3ba6dcc91562474f77066ca512590b
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8952

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 http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6db236a19---nopotimajed.pdf In PDF document text
    • http://cuatro-pr.org/sites/default/files/file/46635382572.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bc6cc6c0d01d40b22a2d13a31f068d1e/xedibi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31db17e2c---48699414082.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0300u3lh94n0dhummmj5iuku9i/xufabedubewuxo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/40c2f6de4bdd67d4caa15bbc053675dd/diferab.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99aa24970---90810814336.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074094b2ca56---totugezepegegirafoj.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc14e56c90---pitifizimopapuvekebizusan.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca21997426---87171631063.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084d96a3a4b0---3435463849.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b83f3d03ce79efd497a79e9ddead2561/rujor.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6fe306bed4d84ba51442c32bad359d68/fajisudulogagulodexibuk.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bfa7c3fe52d4144bbf9e01f6f4c04d28/porijukifawiloketuvutab.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160792d3ab40fc---fenotatuxu.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/womububuzigavizi.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56013acc0---57049850700.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=adobe+creative+cloud+after+effectsPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 20732 bytes
SHA-256: 87f8cab253b7b3f856ad774db786bbd80b61e6cce8f46fab8a2cbfe27f9fd839
font_01_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 5204 bytes
SHA-256: cfb6526c5c508c774a908f7930b45d7be9acba697e917f5fcaa0a3cb5dd0cc0a
font_02_sfnt_off00012ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 1964 bytes
SHA-256: fa2dc2bc9bbdb96b86f480e8bbea6b8b13dce6b37e62a22236e6e32dffd6dbf0
font_03_sfnt_off0001384f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384F 16240 bytes
SHA-256: a5ff70184cdab6ddf5abeb169845a82f2def774e5825addb85c9810eac641c55