Malicious PDF — malware analysis report

Static analysis result for SHA-256 904166abb724359d…

MALICIOUS

PDF

73.5 KB Created: 2021-08-28 10:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1cc73e5ccc6e09f0bb10283bb096be04 SHA-1: 083f9068863fb6881f0c9c468231f4221c12862a SHA-256: 904166abb724359d63ee3af358433f6b89e44b84551f8921aee8a9661bee2ccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://wastran.ru/uplcv?utm_term=after+effect+basic+tutorial+pdf PDF link annotation
    • https://bursakaynak.net/userfiles/file/29133678700.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/25ee6622df5923fe5bdc86d4a02c6500/11014589973.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160cdac2a41ab3---99206715588.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/mexugebutiwiludunuxegux.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4c6059f800336d10ec7027b0698c36f5/nutinuweloxagexu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c2aa6738fd39179ee7905325159f224f/denenesajomitax.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/bcd48f7fa34da5df1dbafc4a57b815a1/24783321570.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5ed8e9aa4ab6c1ef5d80c419ef84d50e/84752857373.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/berujog.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb459785a8d---rigewuxijinajizumebusu.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/67956372023.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5iisc5g5hl63jsd2db83bp2o94/88176003951.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/obf2t82bp34ta3qh9f50ojffb3/27895639105.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c84a14eff---fuxukemekopudokigubumamez.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogodudetebonaxaxi.pdfIn PDF document text
    • http://cwesp.biz/upload/file/37181555535.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f42c926c8639636f9b6c3637b9b2a3ae/viwifuvunenuxewiwixoxilop.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d202009f9---zutiwemabokorokepozuxuje.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fcc3ebe6d---xinovekidekepusana.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb438d771b---juxivi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d159b28ea---41309696784.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/nusoxoj.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/kuwumev.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/5012406711.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737d2dbd5b4---25063733014.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/ledabukizaderinon.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_off0000bf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 10728 bytes
SHA-256: 97a9e0f6a90d420f94a4b2a32ab8a7769c165d100b2cd6378ab11d3316f3e03f
font_01_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 15836 bytes
SHA-256: 30c0d907c42c426b53e1af2ca9604cf9865713d8b915db473d6f8545b9f6771a
font_02_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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