Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e5a87e4192cf4d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 15:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74d4d5cca0c50d7eb0a0a0d3ee806991 SHA-1: fdc3742c3be9cdc7f9d3ebe4d3af16eb4551c624 SHA-256: a4e5a87e4192cf4da4d9a058993f9a8ead65dfaffe847844e9d1dc323838c68e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=start+up+business+plan+pdf PDF link annotation
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a055bdda5e9---18469972148.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/61410487583.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/bolowub.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb3afda73b7b8fe2543dda7ac382a8c5/nulebunixemanikupikide.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/xigavazemulotewokekej.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/74948640351.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/56405318199.pdfIn PDF document text
    • http://peoplefineart.com/assets/202107/files/20210714072448978071.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/99a9611e65ace1dc3315d024654aeff9/bonurixizub.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/jegevizalafujolupo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d685a1aaf---22447235411.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/68371564227.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2161bfdf465e815ea888c6cb0287e925/naxus.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd95a46a62---nabon.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/busamojuxedawinajelirepi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8dd6e6b150b224d8e4a1175de683384f/xelagewavupasinuseforeg.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf7f1c97f4---lozerolevubikaw.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/wezovixivomobibube.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/71066450378.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9u2v1s2h3et2obd7sakkgg1iq2/90957539151.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0818f1b05a---riguxidarewudidefuweve.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62d0e9a31f---tuxezejod.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/lumen.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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 17484 bytes
SHA-256: d0f47e3b5fdf753155d4f58af9c1244aa3da44e8f04455738c9081f2c88979ba
font_02_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 10688 bytes
SHA-256: 63fbb569f2d05e5a20f41b5d54b7faa049bb43e3c902fc4446a7df30da8007b1

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