Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7565aa6d98be493…

MALICIOUS

PDF

93.4 KB Created: 2021-09-16 09:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1e4654a2216dc935b68a2e4219d5c3c SHA-1: afa32b5fb396d04db498828374d59276a8a2536c SHA-256: c7565aa6d98be493d9cf61cba4f7d53e81d429bf9dd7653892d4179a6187c529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://synerhu.ru/uplcv?utm_term=tanhaji+full+movie+download PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613159297582b---penopivoxivevanorix.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kedaku.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/3961508645.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/butadewaxinajum.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb2016b60---33067092363.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kefizepefuzoxizogawapibi.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/luduwidubogarukefozegosaw.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/232f925cdcff98835773c728a1a6942c/85786984102.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/64422669270.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/78523295100.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/79769143011.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/20666582644.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/sogafif.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/51071934028.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/75320762704.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc00515836---32915888304.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/78566241742.pdfIn PDF document text
    • https://phnews.ro/files/file/53089554529.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/72738123799.pdfIn PDF document text
    • http://medi-sen.com/files/files/35083691861.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/31501080138.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/wugesara.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/jowojekuw.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_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 19272 bytes
SHA-256: 0b469f460304d7f058f5ed4464fea0bb02dba4d15f51fe389f377c3b33f7f193
font_01_sfnt_off00013808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001501f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501F 10596 bytes
SHA-256: c9d16b445c4201904cc3308f1dd2eba8e4dd67230fcdae28c4cb60c900cf7571