Malicious PDF — malware analysis report

Static analysis result for SHA-256 3789f85f25553f70…

MALICIOUS

PDF

80.0 KB Created: 2021-06-28 23:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 925da6cbe3a042e33e894c6790f1f860 SHA-1: a0527f79890f3947b4e2248d42fe7ca688efbc00 SHA-256: 3789f85f25553f700ff73b65902f3bd2271f013063238642b2d8f682f16b76b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dobre-akce.cz/media/files/file/50036977036.pdf
    • https://advance-pack.com/editor_upload/file/81824328892.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f709a3bfa---ratef.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b6a37316---8595664628.pdf
    • http://guides2alpes.fr/uploads/file/jajapewoxagefeb.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c79c015d78d0a2e3f0557e9f0da90e83/76773758075.pdf
    • http://smflow.in/admin/uploads/file/52088685990.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/463694c173c1a5d593dccca277ed19d1/fuvixobefuwivi.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700a5ef37d8---59304793504.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/it62g6569fe89bsi4kvfsikvdo/tanesuritake.pdf
    • https://amblamy.ee/upload/file/kuziximabus.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd3710b64---vumewafisupogagew.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbb0359df---61776939302.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3ee2ca98704030742fbaea5cf8e2e59f/sunoxowopezopu.pdf
    • https://motacademy.it/file/24569046237.pdf
    • http://jshtextile.com/UserFiles/file///nemakijaxu.pdf
    • http://vitanova-cattery.com/upload/file/58543065142.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/870bb1feb3a2de985dbbcab12a319790/31414612636.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ca5e8567---gibofuzekutiritosumi.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb244d506---sazerojifav.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e0e21133e---wifuxerujalemomewirapi.pdf
    • https://harkakotony.hu/UserFiles/file/46967629868.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c4da224f87145b8b1f71e83cc3a38d55/gusuwisagoxo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ovotestis+in+humans
    • 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_off0000d861.bin
00cbca2eb76ab5139c1a06e4261d44b20b17c8cd4ebc730ac99fe72b7ce281f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 10420 bytes
font_01_sfnt_off0000efd8.bin
a7f42809ce68eaa45d8be55b9cf6afea99a5e50540bd3158b02bcff6c42a1977
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 17048 bytes
font_02_sfnt_off00011bb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 16792 bytes