Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1cd2903539b228…

MALICIOUS

PDF

69.9 KB Created: 2021-09-14 02:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: daec7e4b108f7f63adc31f31fdd7f88b SHA-1: d3a007ebda044f8f06c958cffd6bf99a6991027d SHA-256: cb1cd2903539b22852e6f71e91a2969ed73aa942e726e4741c96e8b8a73c8edc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://tchid.net/userfiles/file/65026862418.pdf In PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/sobigokasogitidevavopi.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/coj3rk6ss7cu0gascdf54gh12d/65030868503.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/rikaterowutexe.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/gonuduf.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tarilewuwilax.pdfIn PDF document text
    • http://kammed.com/userfiles/file/31045494865.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/sedimeliniwegowa.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/gojomijemepaxa.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/duturorunu.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/44712629679.pdfIn PDF document text
    • http://zzweien.com/d/files/26874773198.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/44841714445.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/zifinavijoleza.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/susaram.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f31feb353---fegilutog.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/vovodifumedije.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/99332441709.pdfIn PDF document text
    • https://viceda.com/userfiles/file/tebedosoxajovumimu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/xokexuko.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d5c5060d---rarisojalikigijadopi.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/burufapuwol.pdfIn PDF document text
    • https://isosklo.cz/uploads/56324240455.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/xarer.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613395fe8475f---denogodu.pdfIn PDF document text
    • http://dfanchem.com/upload/files/toxezuxigoxogadovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+download+gamePDF 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_off0000b4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 14976 bytes
SHA-256: ba27513d6d306de7a041f9e7735d93e6a2eec060ca8ecfe4f2808d8ca5941e3a
font_02_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 10392 bytes
SHA-256: 323528b95ba37661d444a374351bf0ea28032cc8e30a0d3a35eed41aff9e10ae

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