Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6ec37a87d64166…

MALICIOUS

PDF

70.6 KB Created: 2021-09-16 08:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38584b4fc8df4876be63d45bb8129e89 SHA-1: 645fba798b92ed4b5f53c1d5267a42010572a2c7 SHA-256: 6c6ec37a87d64166665fd403170326f31dd87e4b4f2b1fafef1ff5cecd9f3d28
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs, some of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the compromised hosting suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6693

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://club-integra.ru/userfiles/file/gimetaxopox.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/sujawabu.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9b62763c---19539757238.pdf
    • https://eirai.org/editor/ckfinder/userfiles/files/nuzemukukeponexerux.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/41221437709.pdf
    • https://gulamanis.com/contents/files/duninagopixufa.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53747639682.pdf
    • https://creativitagh.com/pevron/www/img/file/29242494442.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8065l5dvle7etg90pgjnsab037/95031221359.pdf
    • http://thrifty-uy.com/files/others/22220874109.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/67278485949.pdf
    • http://www.insight-assessment.com/ckfinder/userfiles/files/kifimonaniromun.pdf
    • http://pinturasoltra.com/images/slider/files/39622302587.pdf
    • http://short-story.ru/upload/file/28601356649.pdf
    • http://hbaoge.com/upload/files/sidorote.pdf
    • http://iwilldoit.ru/uploads/files/files/56911137021.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f766e5056a172daa0596da6da89da2f6/11555450171.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd6f1edfe---6761446254.pdf
    • https://newcar-rental.com/uploads/files/202109080410177166.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/gejobagowesuv.pdf
    • http://vistobrasil.net/uploads/file/sikubakezasotibapafu.pdf
    • http://sziszolg.hu/editor_up/45583869826.pdf
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/jores.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=naruto+shippuden+ultimate+apk
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcba.bin
0a1612367e3ea19e0e560f9451075973f4bb0aefbb6f477c98e0c8e90232c5dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 10828 bytes

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