Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e66a5315bff326…

MALICIOUS

PDF

46.1 KB Created: 2021-09-25 01:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f8d1114c435b749dfa57c50f5f717813 SHA-1: 9dab52fa8024f21ca4e0af4a4c32e25ba243a464 SHA-256: b4e66a5315bff32609f7904e400edb7a14533e4b029c993775bc2af1f34a25ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of embedded URLs point towards an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6676

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://archism.ru/uplcv?utm_term=why+generalists+triumph+in+a+specialized+world+pdf PDF link annotation
    • http://cbcom.fr/ressource/site-image/files/71722291863.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/05fc11c5dd3ac819c4bfab409d782622/rumipedorumujoligazadujo.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/palamovifaxabovanadamava.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3c254bb---20607699033.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/buwutivo.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/kojoxoti.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/94629975562.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/83627590926.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450c670d18d---zovufebajoxogarig.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/46750037765.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109082020219987.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/luvinu.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/guwamojuzu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403ccd81204---ruterezemapofemites.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-23/20210923145945527131.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/55579656217.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/merobudikejowikaretoliva.pdfIn PDF document text
    • https://blugarden.eu/file/94411754065.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/54475740272.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///24886047605.pdfIn PDF document text
    • http://effektfilm.de/files/file/11575339538.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/bimezudor.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/natebijasezijovudusu.pdfIn PDF document text

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