Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9e595f0d7e93be…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 14:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b047efea0315d0afc66d40570712d8e7 SHA-1: d40d1e3f44000b32132d078fa5edd4a09925177b SHA-256: 3d9e595f0d7e93be91bd2bcd2d7a987b7e728516d525e1be8d4258badd400661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress upload storage, indicating a potential phishing or malware distribution scheme. No scripts were extracted, but the nature of the embedded URLs suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://havefuntogether.com/image/upload/File/xuxodepufazodizotozulo.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4756cb83d---wibufesixokukivavax.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c2b7932b---setifamivitiboxide.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/bifafufunodefipe.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/bixenuvimokafozusuna.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/94052592496.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/ferufeduxagokibowawa.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/42028770085.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/10747210292.pdfIn PDF document text
    • https://denimder.org/resimler/files/95661419907.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/85527321600.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/gokepenabikusagejil.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/30102961729.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ceeaf104---lapokekaginaxu.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/fememuzukukofajebusotubon.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/vinefunafe.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd05c05a06---73736370549.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f49070dd---47037548410.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/61604585081.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/dufefibajoroze.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/e5cp8culs4b46a9c83844hc3k9/63255635311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=accu+battery+appPDF 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_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 20340 bytes
SHA-256: 2587c7358f71ef7c6c464997c0d70a8b463efa6d3374998b86d3c2092681296c
font_02_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 10172 bytes
SHA-256: d4e420ba6976c349324e59bc807d36a6f2431673bb8c74d24f40a87105b984e1

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