Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6980f3850898c5…

MALICIOUS

PDF

72.0 KB Created: 2021-06-14 00:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2f8c6e450ff1851d58cbbdb900fe70fe SHA-1: 1dcf26d9fca0f2bdeec942bcbd7ebab489465048 SHA-256: ad6980f3850898c592b18f38ecdc2ea7951b0bfed94431d1aac6e59aed24043a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it's used to distribute or host malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9731

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=most+commonly+used+idioms+in+english PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bdf25be787120716c9806144427bc88/95887194467.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5f99e7737063c256914987550cf149e0/bapugetamu.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8615e5fa5747f7ed31954021c319757c/sosalisuragevixuwinib.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c84dd1a7---sapujoderiva.pdfIn PDF document text
    • http://esistore.be/userfiles/file/86586785321.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/00f6ecf6c6f9da471bfbb62168e5e6ea/nupaxezulumip.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ed18ec32b---depojawukuxojodiraxizep.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/dexuk.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b439e2a0---36281012683.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/fobomelopalamuxarobakisaf.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ckpvfasr9ub58u8dmbba2o2221/17031209556.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/dewemoberelilirabe.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed9ee2ea2---zidibul.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f439164d---surufafisenopi.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/wekitizurelikipusajawotak.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fad60f8e93cb55142413aa89c34babab/30685269190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 5036 bytes
SHA-256: ee98591035112ee3f4cce37b47cb035ea12c5ba9db1874d2ba6a7cd14ebfb54a
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 10588 bytes
SHA-256: 24cf0c967119911f16cea190ec1cc0954d08f45e9b6a6a6dc69b621700d6f482

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