Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d929cb934fe25b0…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 06:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a7f2333a29a4ffa9701134bf7af4a04 SHA-1: f789ed91b2e51353ed84ed88db5e680b6385050d SHA-256: 7d929cb934fe25b010f8c9e50cbbac0bb55f4aeb80a1a9799c1a1b2d2c285f1f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, 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 delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=thoptv+download+link PDF link annotation
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131092a25828---nixodidomebukalom.pdfIn PDF document text
    • http://handgun.ee/media/file/89041058530.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/40945224108.pdfIn PDF document text
    • http://hanauhrova.cz/files/fugotogaloref.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/pijexuvotelawepezakuz.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eead31ce81---38051289782.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/debowagevutatejaguwokaje.pdfIn PDF document text
    • http://novichiha.ru/pic/file/1857583657.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/90643647121.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/wumatisataterapikezuxo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381edaebe46---kuvol.pdfIn PDF document text
    • https://emenu.hu/editor_up/jivisizokuvu.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/kofugewifewavolofixolelu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/26546562792.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/durakozufufomipemiwufatar.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613951f7cbc9b---gagagafopor.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/72065243257.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/j8go58vv73tarsf004igjovvm5/tutivemokawiwewexu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161396f704d8ef---fizodurukapasijusuk.pdfIn PDF document text
    • http://mebco.ru/images/file/17989301729.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/52523269531.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/sazivepedogefix.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/40092961451.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_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 10296 bytes
SHA-256: f4915f5d28a80db8c5879b4d051b49cff67d3b34fa011beaca8cf2838124b780
font_01_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 19128 bytes
SHA-256: 0ca5bb78d09354060bf44ea0653e18e618e82cba800a46acd6a19473c5097cfd
font_02_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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