Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9410c89af47545c…

MALICIOUS

PDF

65.6 KB Created: 2021-06-10 12:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9e150d89a068f6bfd3d6c2d53918628 SHA-1: e5748f98977945353108068ae1b2434e87165d86 SHA-256: b9410c89af47545cf4d9ffeaef0711f64070c199a0726680be6496739ec04ec9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and contains no readable text, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9729

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://infrive.ru/uplcv?utm_term=borderlands+2+codes+weapons
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6097ca83f033eafc08693f82cceff10b/57659521752.pdf
    • https://diedacorporation.net/freesiafiles/file/78105116550.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ba12c0a7---51287943430.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee62e3ed9c---jovunosewi.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11840a4e5---30274143803.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/64b90117c71fc825da4eca74b5014038/83934728765.pdf
    • http://copy2d.com/ftp/image/file/93699129990.pdf
    • http://prime-standard.com/piceditor/file/lerumijever.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/27ecdee2309227cd4099ebc211e3df56/80837006589.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/soevp5mklrronfpa55g9b0nh7q/55902979228.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384eda6f94---pigosasiki.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7357ebc16c---18109728175.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a1d5ce4b---86169911464.pdf
    • http://bebelino.ru/userfiles/file/47701014773.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/900e7d7cc74ecbaa9d2ea7a8c55a3047/zaxuzemugutudutinuviduwaz.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_off0000eda8.bin
4ba1919fd20793380e08c8a5fecc0297c2c8f5ee35a8576828b6d82b63b20c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 5340 bytes

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