Malicious PDF — malware analysis report

Static analysis result for SHA-256 e947fabcb4181c33…

MALICIOUS

PDF

64.9 KB Created: 2021-06-04 09:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8b360d991b3c280332f80debecd0362 SHA-1: 3094a024f844c327c4c5b5bc640a6f786a50cdad SHA-256: e947fabcb4181c33229ce3fb54e28873f5a552e693ed53dfa85eb4adbb4f4fa2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' and the ML classifier further support its malicious nature. The primary function appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9111

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hmanagement.net/userfiles/file/556780456.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/utgojsdud1grkq93n8vuho23l6/24542416165.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091556a91474---93240313708.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/jozerulufosi.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/daad62b6397a89afa6460fd808b75e28/51459039981.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8766b90730360d84a133d753c364078b/memiwidetirujizigo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca54e8587---21079418231.pdf
    • http://files.ibiza-ferien.de/file/vefavutoduxorozuge.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/19065974120.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/afot9otd3cjdc71iba7l5imfbm/88191516856.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/drr7et6r8to9k0qi5fih24o0fg/21271845656.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d39e9f95---rarudoreriw.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f7c25cd0c2d6884c0ede18aeed57a8f5/poxixegatu.pdf
    • http://interwork.sk/userfiles/file/96868335260.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef1e45e1f---8925460751.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=figurative+language+in+the+great+gatsby+chapter+9
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d404.bin
7c6ca990a79712024f44feb97bdc98557cc3166445e1a2ea5f4c9b7232449d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 5608 bytes
font_01_sfnt_off0000e71d.bin
1a3e0dc1494f49343e1eab66f01e7d5a1f21064cf0d9d3a25bc48daba77fe1bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 10288 bytes

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