Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05a8091d0a326da…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 13:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a75c56f4ca8b28a78006ddb68921ed7 SHA-1: ee3e1c12aa069098e755df6d04edaba5f82c837e SHA-256: f05a8091d0a326dad2a3dcf93679fffb87c348591a4ff082435b06e2fdda110d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://krisoc.ru/uplcv?utm_term=free+classic+movies+to+watch
    • https://thuaphatlaihanoi.net/uploads/files/xumojokijo.pdf
    • http://kocavietnam.com/upload/files/mizopumiwonej.pdf
    • http://adec-interiors.net/Uploads/file/37000511139.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/digevek.pdf
    • http://iviltra.lt/images/files/wofijurudaloz.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/25039950848.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/pupekuput.pdf
    • https://mimpidia.com/contents/files/nimezetanefigido.pdf
    • http://escalierdurire.fr/ckfinder/userfiles/files/90439797140.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/41823725451.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148679a63e7b---6698380763.pdf
    • https://chief-moving.com/editor_upload/file/numadekoxazaverarokewabiw.pdf
    • http://themetamorphoseprogram.com/userfiles/file/dagoxoseva.pdf
    • https://nonbodepsg.com/uploads/files/22787262966.pdf
    • http://pitchdecor-construction.com/user_img/files/xurujekijodolut.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210918170259.pdf
    • https://dehayemek.net/upload/ckfinder/files/kugubowa.pdf
    • http://pnmanagementsolutions.in/uploads/16840570855.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/78637165588.pdf
    • https://llbyggodesign.se/UserFiles/files/wokuwomabot.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/sesoputoke.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/r6v4n5r1a84nq6mlljb6u2lt36/19814906937.pdf
    • http://kayapalinakliyat.com/file/vabomapajomotagepurutu.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67762dce5---40054182045.pdf
    • https://minhkygroup.com/luutru/files/89866431292.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16792 bytes
font_01_sfnt_off00010fa0.bin
53b994c48eabc956d7d5cf94308fdb53e90b3acc9e7e55b50926653722718ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 17596 bytes

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