Malicious PDF — malware analysis report

Static analysis result for SHA-256 f183811dc11d70e7…

MALICIOUS

PDF

48.0 KB Created: 2021-09-27 16:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf8e9f0055cfa2d3803aa4cdf4ef3134 SHA-1: b461eceb1a0b00ab9e752f3874e27e1bd047aba0 SHA-256: f183811dc11d70e77392a923a25fe9e189d592cdabe88321b0185464e8b9f616
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8402

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://snoman.mb.ca/ckfinder/userfiles/files/52486704876.pdf In PDF document text
    • https://protraderin.com/userfiles/file/45832524368.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/749a577bb67a27edc79ae1f3963786aa/18730908941.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/dulomikivem.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/nuwekuvafifuzafazo.pdfIn PDF document text
    • http://c-amc.com/upload/files/7007900153.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/vaduwa.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/12639479466144831b30d59.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/fifigugirasoga.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/81701427180.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/32635156204.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/68950864398.pdfIn PDF document text
    • http://csp.hu/editor_up/tutipudekekovo.pdfIn PDF document text
    • https://amgaa.org/temp/files/86215565712.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/polenuxovagifimo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ps86vf7jidvnhn68hjd6vb6tok/botow.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210917012553_536569944.pdfIn PDF document text
    • http://cycling-software.com/files/file/digat.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/fudam.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4g0da9gmu2r07rpfdjrbmkkrnn/61811683779.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/pokizunajugukalonanagij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=open+task+manager+androidPDF link annotation

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