Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66e6db4fe58febe…

MALICIOUS

PDF

63.7 KB Created: 2021-05-21 12:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cb8bc67656ab2e29d3bf4665ef209fc SHA-1: bbb58321cb3adef10f3561f93dcd1acb2c3b04ae SHA-256: b66e6db4fe58febea15cc7ec15eeb79a751eec30409e8b678519b6c7e3233c2c
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://irlanc.ru/uplcv?utm_term=como+programar+un+control+remoto+directv+automaticamente
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5e2792a60034352a61e65cf74d3cc9c9/97199302620.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722efa23e86---32724242216.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1da8375a---90954669886.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gsd8165snkl3088esdfpskbdqh/82501327237.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a07d911ca---gotumosedeturukenas.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/chsidesbeq01r1a4c7acvmeng0/tasizupixomu.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160903227d7837---lujotenoxivowokaxureneji.pdf
    • http://akicgiyim.com/userfiles/file/lefufanowukedesabefe.pdf
    • http://botosani.ro/img/uploads/file/96612693258.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/144fa152e57659172105d9a43e7633a4/58996813967.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/36207708becea7fd71e4cb32796cbef6/23644768270.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e827c680---14707570688.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752824643bf---91295756466.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd411f6a8---33356410236.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc0f6f358---wifewotaminubaxevixopebi.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_off0000db3f.bin
804a5412a3a824d0cbf038627d2f1883df4b25217c4ad0ac3494c030de61d814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 5180 bytes

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