Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c2b3e95c5ca5e8…

MALICIOUS

PDF

42.8 KB Created: 2021-09-06 20:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b05ac24251ab9caccc39cbdb03c23ed9 SHA-1: ffb146defac2b269947f123ac32c7030dd5b136a SHA-256: c9c2b3e95c5ca5e87dee9293880a08a8c28c6513a10d8d2de8c53ea62edbc7fd
94 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7479

Heuristics 4

  • 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=nishiki+bike+manual PDF link annotation
    • http://bobas24.pl/Upload/file/21880469203.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/setemevujakovekebur.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d22b25745c46b3acf33733e290b19e56/24300253361.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c939b5f2d---xotaxulusanokamufipanenow.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160708a69789f5---vaxuregiwuxus.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/39722543857.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c0712160---famomafotaxuroxemomefi.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/gujedixe.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/waretidekudurejuxesun.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa0b10c087---tivibosum.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/78588918466.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/26749437440.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210829060037569950444.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/29319461105.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/dumatorozojabage.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/fejedur.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/jugonegugezafafu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c949955c78---jixisavubobe.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/potovewogoninazuwivu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/77810385072.pdfIn PDF document text
    • http://bienbao.net/uploads/files/xujiboxerodizi.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/bajimenedusatijerozit.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/736075023.pdfIn PDF document text

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