Malicious PDF — malware analysis report

Static analysis result for SHA-256 4663cc8a6fc9a45f…

MALICIOUS

PDF

53.9 KB Created: 2021-09-13 21:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9c7d329871981f866927e595e408786 SHA-1: 6493751419c68cb5f95fe60ed425c54bbecc0254 SHA-256: 4663cc8a6fc9a45f64a8423d55c7ce083511416bc07585b36fe60e97c2c567ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8263

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 http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5325c38c66f639477f8389676ac43fcb/69816790008.pdf In PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/tewuxigomilan.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8e6d8be3e---51713435200.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/mepezizido.pdfIn PDF document text
    • http://qdjshg.com/files/file/72061045538.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7993f66d498aecd1ee12c02f3532303c/sukikul.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tosagunaxafurenul.pdfIn PDF document text
    • http://cx-gl.hu/images/files/38857895277.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d192925c8---lubizumoj.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210902082706.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/73250189069.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f9b51cb115a19765965035c6356e61dc/97541367110.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/vafesajobutugif.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/19816645589.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/96037488493.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/wuxipumuf.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/17665512617.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/zovadodivusopaviraxim.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/xavefaguvuzofone.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/43304503104.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/xeduvikotetaxet.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/fovora.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/46618320276.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/butetugotememes.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/kutuxufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=metodolog%C3%ADa+de+la+investigaci%C3%B3n+las+rutas+cuantitativa+cualitativa+y+mixta+pdfPDF link annotation

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