Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b785d1eba76843…

MALICIOUS

PDF

92.9 KB Created: 2021-07-31 14:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8508777d21f9e794e47bf5ccabdf4a5 SHA-1: 81bb5d0b468f89ef464596434771ba527d096101 SHA-256: 66b785d1eba7684379226ef10bf648a5d0228d354f067c84f86e437246c7a384
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users to malicious sites. The primary purpose appears to be distributing malware or conducting phishing attacks through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9365

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://anhuifan.com/upload_fck/file/2021-5-26/20210526033112240608.pdf In PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/xezikosojoputejujus.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897d7b64ca4---mapivijixe.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/gewuga.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/tinujilode.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/44313798169.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/074a1d82104e10148a47617551f3e987/lufodiwemutibejojibu.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/biraxirorovupad.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/57041254584.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8aa2dba25---wutetaboku.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b90246c772194bafc558d9c84bccb22e/2762073469.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/81332401359.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55580acc45---44573104622.pdfIn PDF document text
    • http://renknh.com/ckupload/files/pasas.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikutet.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/visitenozugadovipajozo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5gn3g517ov90cjlll83s3ogetd/piwojebusadelaxuxujuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ppra+rules+in+pdfPDF link annotation

Open this report in the interactive analyzer, or submit your own file for analysis.