Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6c9823a95356fd…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 14:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 065af3bace2513d7346bba72fec6dd7a SHA-1: 24001a51fcf2dd5abc144d8ad4ceaf2b631ef6f1 SHA-256: 2f6c9823a95356fdeb92c722ebae3cdcfe79281df37773d9cc83ef17d2324d39
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=sons+of+anarchy+season+3+episode+1+streaming
    • http://campbellelectronics.com/uploads/zepojebixerana.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090d36eacad3---54051262555.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6431d5ca320bfc388c6e5d869c676b63/jilodulojunako.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/8aepdqd954om1kej888os89pq4/kumikipalerukozepiz.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oerdbkl1fkaabbp0mcir3jr6h6/69026881743.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/67081696858.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/h7ebekjm63ovl9r8jqrv8b91g0/1187619180.pdf
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/31365918683.pdf
    • http://andlupa.com/userfiles/file/kijodidenapivigifiti.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b2e6d6dbe---lezudeketizazibilo.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfd12ce66---53678769024.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/rijivutolazubizul.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b297c500264---mezega.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/e05e04nsnialo0gs396q0k1iln/dasega.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/769903f225a41836bdc740871c88a223/86296944699.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jiropejub.pdf
    • http://saovietgroup.com/upload/FCK/file/rutewabafijogawafusiwuvuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 16792 bytes
font_01_sfnt_off000105f8.bin
351ac8b3d07603f27b8e73ff93bcab1829d2242e5445269d5fadf29850e3859b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 17112 bytes
font_02_sfnt_off00013240.bin
b3fa0dc5a4ad0dbe6d3999bf58e2e8f99137e08c6d8f099edbe6a030f2ead24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 11432 bytes

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