Malicious PDF — malware analysis report

Static analysis result for SHA-256 816cbdc6c2a9be97…

MALICIOUS

PDF

88.1 KB Created: 2021-08-09 04:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07a83773851bcb5435f997e666f6a3fb SHA-1: c9bbbf65f1c3e37fb87c31004497dff533241b35 SHA-256: 816cbdc6c2a9be97f7cca171d40f70cb538db8613b62b93d2d62e1cc2057d05b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://creatinglifeoptions.com/userfiles/files/27254371898.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b5d63456---1243603918.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/84143005466.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4a809ad8---dufuboluwezajovugufa.pdfIn PDF document text
    • https://avvocatoboretti.it/file/40621724789.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c188abe44bb75d5a5b8f9498b30843e8/61889992424.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b24a6ba0c---joxuwudajutukafizefafafuf.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/noreluzidapopasalokopedot.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/65f400qnnr16m6t720tk377200/83005661534.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba3f9a4349---kemujaxodosegavaruzure.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aaf3e6182---2177955964.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/aaf9381334c0dcd76a4a09e3f8da4699/sonuvujepiwako.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/43025278181.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e540a9aae52---depukelejovam.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/31its7d7m1508vfckmrpud7kv1/jumepiva.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608609cd8a439---sixogexabixufabufasatufen.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/191f4f4db2df89a03c65c94ef0c006aa/legefowaz.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba73ffc5d05---75157570928.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/80369628099.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e40f909fee---fozisabedavorawibazuto.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/krcf1mlntj7d735fv93osm0ied/17570275942.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/61490846038.pdfIn PDF document text
    • https://ekransamara.ru/files/42440973816.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/91728632372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=top+latino+songs+2019+mp3+downloadPDF 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_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 17304 bytes
SHA-256: 679fa1e7c0591919903afdb7b355aa4e431562b9169603a7d7050e132ee5190d
font_02_sfnt_off00013938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 11188 bytes
SHA-256: c1457a03a52d8b3f897d82362783d8b949a03733b7c1a38f0f981af9fc526915