Malicious PDF — malware analysis report

Static analysis result for SHA-256 4668167ee000f5bd…

MALICIOUS

PDF

41.5 KB Created: 2021-09-20 22:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b39be32973d44416f7d3c4ba7c610484 SHA-1: 5d17487e77b30dbf8b5302a165cf9b1bd809ffb5 SHA-256: 4668167ee000f5bd20eb7f4dde8e39093888991ce7e279a87c8f77e355c56add
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern, further supported by the presence of multiple unknown URLs that could host malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7987

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oldmotorsclub.com/files/file/pelexakavuviwobeluzela.pdf In PDF document text
    • https://hotelmitrutarija.com/uploaded/files/vetiz.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kugawibedo.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/9799157191.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/bazaluwevufigazapusewuz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e498e0686---papozibeja.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc7216cae---9438770908.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/xaruvu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c385922ced---misokumelava.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/51896072073.pdfIn PDF document text
    • http://drironcat.com/images/file/76226314434.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/dijuxofivug.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109072312237196.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210905_34B53A427EEFCC68.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ea781a3ebece3ab11deedc83b581a435/72311925499.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/lebosepifisanupug.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/vudevo.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/81157886911.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/jilobikaxado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=manchester+by+the+sea+yifyPDF link annotation

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