Malicious PDF — malware analysis report

Static analysis result for SHA-256 5837afe7c59e246a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-22 11:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6df52efa7242882189187ac2bdd62142 SHA-1: b83adfc350d579ce3e4b495ec115aa993b19550f SHA-256: 5837afe7c59e246a172deb1506522ae559f1d9473147dfa5a39a70b231413477
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://msiutilities.net/documents/laxoroxujagugibepadanu.pdf In PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a1cff1f13c0083f7691420d5fb2f3649/27279532350.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/poxipidovenaxuwumafowi.pdfIn PDF document text
    • http://dongphat.net/upload/files/21290886903.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/8793220888.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139e4020db38---90072788189.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/19567977883.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/rawelukeketuxewoxatifel.pdfIn PDF document text
    • http://i-dron.cz/data/file/bosokufuvevawilixexi.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/janone.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2d67fcfb1c0b88b74f3ea7046a18e182/zatalidexakowizigetojufiw.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/53532933339.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/91243839779.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/00fc09780f32f06f8bd236a2c27f7f48/9326983748.pdfIn PDF document text
    • http://pmke.cz/pictures/files/wezufebapinasadizavidufu.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/85306943005.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/116fb98da9759cc2993ecd3c2a3d8a6d/59259923800.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vpcs2onv8sbap3ocsho12klb33/8160561822.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/relesepatidotajubijonugag.pdfIn PDF document text
    • http://th-hl.com///upload/files/bobifekarar.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0e2b1d97---31932810626.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/xatakamarad.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/27765858203.pdfIn PDF document text
    • https://ekransamara.ru/files/mabesevukerufeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gold+and+goblins+mod+apkPDF 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_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 10676 bytes
SHA-256: 6f4b57323c6f7df4523f70ea46981c48c8971f7c2d7b602cefeeb1b994e52cf8
font_01_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 17444 bytes
SHA-256: 6c53fbfe5e0c981ad2a47b2eb043245420431a6af5f4b3b0afe9c1662d4bbac9
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1