Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c416fc7a880c7d…

MALICIOUS

PDF

51.1 KB Created: 2021-09-18 01:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9946876e2bba6c5e904907f0b1657376 SHA-1: 919b19424c478ac19db013770ae7ce0c18680a9f SHA-256: c5c416fc7a880c7df06ec734970f1736676a9d59d085c62091d3a172198674d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and link farms, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the PDF's structure indicate it's designed to lure users to external sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8037

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=android+text+browser PDF link annotation
    • http://praguetransfer.com/files/file/56175245914.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lonir.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/kufigavowexikixa.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/57637472190.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/46600519700.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/60201819269.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/robobebu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jukivisudi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614314b9df6f0---20552904339.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/wifilidijataxowasibuwemuz.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/24060876471.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/55161232856.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5280c3c8---13576881438.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/81950862566.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/96849240286.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc1c50e78---lidigulajoxosufubezudebi.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/85524044597.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/lanuxejajo.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/55305526056.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/vuvawejimabamijujoregufup.pdfIn PDF document text

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