Malicious PDF — malware analysis report

Static analysis result for SHA-256 f667850a07e5ff52…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 13:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b32a3769aea144efad14e969b316a76 SHA-1: c58a6d8f36166fb1963b7beb6e9f309d271aea7a SHA-256: f667850a07e5ff524944d51fe255cf2068d1c084e90b0122f1de178dba903d56
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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
  • 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://coebmsf.com/userfiles/file/50851058602.pdf In PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/eaf43e7dbf27b4daa9f2ab2a03620be4/72591689571.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/jumebeneviv.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/jelik.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f79b405ad83be7a01cc8df49142af9e0/momimevufugerino.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/40177741762.pdfIn PDF document text
    • http://classtool.info/upload/files/dodusadadepeni.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/loglj3es89u314oigrnv0eosie/kivajabiwebowinake.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/wizobabigoxerumonuf.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/43864706097.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/mjd07shafu38qr6sjhq01b5d71/42010925217.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3f805b27---58773385019.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776df071385---61657597154.pdfIn PDF document text
    • http://thedreams.cz/files/72988742113.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/iuffhq9bgorg25bsdc45g515gr/kazeveso.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/texasuga.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bb2d40d4ada5759acc720106e40d4571/623721304.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2b730482c2ab27642f5777e8e83d10dc/danukikarelexefilamewijal.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/wowodode.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/tadanediradadagojutagut.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/45421239876.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56dcd7aaae---19189172501.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/bakokejisiwujezipiloraz.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/94252588696.pdfIn PDF document text
    • http://wwstationery.com/files/file/47881332457.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a867c6fb8---kojixafarara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rohingya+crisis+in+bangladesh+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 11100 bytes
SHA-256: adabfe58b3c8da855e104cbe879df73647987134a97ac45cd8076fa69fff4401
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 17888 bytes
SHA-256: 43b21bd4e1aa329b64aed679458b68d0f7b2cf3d257881a85ccaf30e8eb8235c
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1