Malicious PDF — malware analysis report

Static analysis result for SHA-256 b402e7cbd5c4c5ff…

MALICIOUS

PDF

49.8 KB Created: 2021-09-17 16:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 071ae9d62c8ee53acfe215b445c02c91 SHA-1: aadd222390b836d499b4144d1b6bea695e992545 SHA-256: b402e7cbd5c4c5ff45f8276ba0c14fa803905b3cdefb686800f24cf116d45c31
154 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8005

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://prestopc.it/upload/file/xuwanudeje.pdf In PDF document text
    • https://hygradeinsulators.com/images/uploads/file/bexoxesoxemedaginubi.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/rupoxot.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/9446971831.pdfIn PDF document text
    • http://abc-tel.ru/data/File/41853521314.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/pinesuv.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134da14ad24c---88130789660.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zuxapemixabajamiwino.pdfIn PDF document text
    • http://co-mit.com/uploads/files/24229152720.pdfIn PDF document text
    • http://surausa.com/uploads/files/62299329577.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/jusawijaruwon.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/71707775304.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/73142783577.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/71018361062.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/34401417986.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1a3556e3---69781991189.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/5031211724.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/rawofuwiwomojeb.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/5833833366.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5993cd1e---xorozofabusonetan.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/mudofumudugad.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/guvomoverupu.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/18407776943.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/10849760283.pdfIn PDF document text
    • http://lodoshosting.com/calisma2/files/uploads/fudige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gameboy+color+onlinePDF link annotation

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