Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d82a607309dc6c…

MALICIOUS

PDF

70.3 KB Created: 2021-08-08 07:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f9b46f91e66ed6beaeca4d083a8e426 SHA-1: 73a2e3c84db351fa9be967d5bc8dcece8fb232ef SHA-256: c7d82a607309dc6cb7b859c2ad8f8c696be638a86126510415c9c3df177f0b38
154 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to other PDF files hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm or SEO poisoning attack. The presence of these links and the overall structure strongly indicate an attempt to lure users to malicious content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8802

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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/uf603a5hpranrnfjigvvhdcs5k/memubufop.pdf In PDF document text
    • http://guerrazzi.info/userfiles/files/kigagofijanofixefafadusu.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/41204864607.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/84240251680.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/7940990360.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/bogonopet.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/875epcgbeorag27uovr0r5aq27/xipegekugumerinu.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/97504170381.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/godokapusupuzas.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/saluziwugefu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210513110010.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/57455997826.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/89451271861.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/658cb8aaf13f96fb6854fc5be8ea1b41/92208160688.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086811c6d0cb---lutokizigat.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/74027941527.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/xibexexukugodumopexi.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/voxifok.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bce3b63c5---59887876678.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/880f414b8e29d1da77b357cb1f6f25b8/gafodabu.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/sotipabavi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7fdb14f74933e387c1ea3c4e45a8bbd6/jupegu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/be8e8f10f26d8964a72d746cc5507e65/winabosirenigexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+foods+can+i+eat+on+atkins+induction+phasePDF link annotation

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