Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fef0e4aae884d29…

MALICIOUS

PDF

80.7 KB Created: 2021-06-12 15:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c90c407e742a10d60b43b6b14a3f24b SHA-1: 5b020be5d004de6827f0a8cc4a3928aad1f99de7 SHA-256: 6fef0e4aae884d29fa13e95b628961492c4060f60d183af1c08f77570463aae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=telling+the+time+worksheets+year+4
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9b86bea7d70657457b9c71d064d32288/piwenojipubidatobav.pdf
    • http://brandiassociati.it/userfiles/file/nigemaz.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/gt7h73ic00bqfhgvs6nfck6fkm/zemumagalokatawunagi.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4satnr7mj3q0b4do8h0eb6it6h/61355344370.pdf
    • https://arvikabc.com/images/uploadedimages/file/7254521634.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088332a94921---fojoresurabinunom.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a2c7fcea---towidokabaridekagojebuzes.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc676d5ac---runadezekit.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b7d0689e1---69750798444.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b6fcd934---jimijudilejikutidigibulu.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35e1ea77d---rosivibaxobopijogeziwuv.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a817fcc7---1291459695.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090664a5ad41---43521361419.pdf
    • http://drivescuolaguida.it/userfiles/files/noxebilawalexu.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d162e5e333---pobitumogi.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d09df606b3f4e4881ec197859b65e7ba/kudikadojamexuw.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95d1da1ce7---piduduf.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/674c42c40f3f3c9c9807e3a6b0c6c848/jemezido.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62054935593.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/97c545af9143081f0855090c2daed389/58834849148.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe23.bin
bf2ddab2292d5eca55c298561a3aed75e89cc68d396915745e62d9e2b90f341f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 5392 bytes
font_01_sfnt_off0001106a.bin
a4dc99c40824e5cdc446f75a23d4d67f5bf9abd5ba20d923b0e94676983fe438
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 10400 bytes