Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccab4a9e690cb94…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 21:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86e4adbb158ebe88c815759c985dc817 SHA-1: a735308a53dd285d3d2c790b175ed0ef44c4a0e9 SHA-256: 3ccab4a9e690cb94b2904c3072d3e2a2164d5aaa65323206bc8f8cd614b7e2b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics (compromised CMS upload link farm, SEO disposable link farm) strongly suggest the document is designed to redirect users to malicious content or facilitate malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2f0af9df---rilexejodosezewut.pdf
    • http://mp-journal.com/media/file/33851123180.pdf
    • http://naturestuff.nl/siteimages/file/xuritadapesedaf.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ef3314ab---fadurenanupinijoriribado.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/bfa91a07b42628b0bbb8f2ae2cecc695/82503523830.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0ac077d53c45666be26a1b64136267da/vewaneb.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/398d7b5437275cbe632e8fb72a4c6420/gawezodus.pdf
    • https://ascinfratech.com/clientprojects/trading/file/76966981560.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b2a192960fc10bc6fa9945813935bf44/kusuvores.pdf
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/xakanomubaduwapodegija.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d869a962---nutixakaxusudivuvimel.pdf
    • http://les-dvorik.ru/userfiles/file/logazovamurulezo.pdf
    • https://open-call.fr/uploaded/files/rifalujiz.pdf
    • https://aventura-agence.lu/userfiles/files/bonadatarogonejadebefaxuv.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/4047961667.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160806f0fd9f0a---pibajonosaxitupu.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/38325227141.pdf
    • http://dailyxedayhang.com/userfiles/files/bezimerebisisilenibupif.pdf
    • http://renovator.cz/files/file/lijetugenutet.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf150fc73---26340000279.pdf
    • http://citywideok.com/clients/75789/File/60742362414.pdf
    • http://imssp.by/data/images/fxeditor/file/rodafume.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/317ff0b076df17ba332da1d2a8ba52b0/fakefupiv.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fa159a577b5374e6d74a32f95806399b/31635024760.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=automobile+engine+parts+and+functions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010785.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 16792 bytes
font_01_sfnt_off00011f97.bin
672c8e3ac6ebce0491a340259df650922c804595a287bfc3d626de0a4b137dbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 17912 bytes
font_02_sfnt_off00014de5.bin
b578382a04bbe272729bfbd2f878962d5d93008b3c74c4410e4d6c5dc49d82c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE5 11184 bytes