Malicious PDF — malware analysis report

Static analysis result for SHA-256 be54a39ed1f15ffc…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 03:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71745da70ff6ed979ba33ca7f4142c3c SHA-1: 50233a6660cbcd1267329f9c002f00c2971384a8 SHA-256: be54a39ed1f15ffcefe03939150b51662aa7198e641c46fb6c112cb5d4f4fba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or spam distribution tool. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=software+craftsmanship+pdf PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1f5d0c61---zubibif.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608537c37dfef---vunapaxegedanib.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/73bdbebf6f3129ebb4970988c3dc4fdb/29288591394.pdfIn PDF document text
    • http://unseretochter.ch/images/file/zavebarugiki.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/porulimadalux.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/logikokurafezurub.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/24b31c34f4b09a8d819e1e3d764df5b0/36303632258.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b32fc1b4f5---31108007831.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/nogezumuvubowuvu.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/dogidomutibukuderazipa.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/diniluxoxofedizukeg.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/lorokeka.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3162b4b2---29219230446.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/nizapasaxegikavofunox.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/5155301076af6b9442e4bdc99dfa0a69/marupin.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/31045112066.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/22765560577.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/pbs0nvllk07qteo5ss6s7odntk/29634830449.pdfIn PDF document text
    • http://immopolignano.lu/images/95122621934.pdfIn PDF document text
    • https://pepsima.biz/files/file/39816832692.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/n7m8eho0fnjtgbqc7e2aktskds/wuwos.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/2474686779.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/17091519432.pdfIn PDF document text
    • 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_off0000ca47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 16712 bytes
SHA-256: a2743d974796efc535435714464ab349a167f34193e9df0e9c0d1434f8480f5a
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 11000 bytes
SHA-256: 14c27233dd674f518011d544435644a4b69c058c487e590fe623dd1920c5147f

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