Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f720c8f4de5303…

MALICIOUS

PDF

67.9 KB Created: 2021-10-12 02:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0a959165026c596409f7cd823e59c68f SHA-1: 6d898e22035f8eb9b89148c60e0d06fcd6b9e5a1 SHA-256: 33f720c8f4de53035e5e739806cd6f48b0ae5f427980d52682c2aff7e81ff8ff
124 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. The primary attack pattern appears to be luring users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5460

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.centrosanmarco.eu/img/news/files/1120630807.pdf In PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/76892872654.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/nifowetenetifofu.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/94590673733.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/17602546941.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/52826873658.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1933509316133d57575d20.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/bezejorel.pdfIn PDF document text
    • https://elearnhouse.com/userfiles/file/golow.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-10-11/20211011041300701053.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/70962134518.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/lulazonixuji.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/2996649726.pdfIn PDF document text
    • http://schubert-hh.de/image/file/90411192467.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/zoliravo.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/30492043487.pdfIn PDF document text
    • http://whatdwellswithin.com/file/24435639340.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/kopesoridepenuvibusiz.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xikujepovukovafaruf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tm1c48r7smt6j5jhff25pkp2t7/32522731992.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/30637628434.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb03c2e36---44763953909.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/dofolamikasegapur.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/legirulafikaxikevubu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=water+quality+parameters+lecture+notesPDF link annotation

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