Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c111eac1eaa694…

MALICIOUS

PDF

54.9 KB Created: 2021-05-13 23:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f04a7755376a1a8be26898ebf45aadf SHA-1: 61cf3852e988910b6a18b4aaa3d883350412ceef SHA-256: a5c111eac1eaa69484c14cf18d853cbd10d3860e071a5eea13257309823314bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an effort to host malicious content on seemingly legitimate but compromised websites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7658

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1d792491---7846899182.pdf
    • http://nsdadventist.org/FCKData/file/gogazixasoludejijezenedan.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083d69a2b866---xutubo.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609567ea6c5dc---paxuwinunolaxebufafexiso.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/290332cebba2611d367414a39a0fa602/21645039319.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f857893c83---madam.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906246cecff---razusepiturupazukexomap.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b536f8f6---favabezikozuzepud.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6c5766f96449249a539ae1093b2d9690/90095063564.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f85f07311ca843c06d1018a8825d65ab/93178542056.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fd2dd2b7---wekixemivuripime.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160902371c37e2---7655589159.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/22suqp7cfkhle5fur75ka3b6v3/79149154256.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rrco0f527ivotkog6ugjhccu4u/jakekugefedobimefi.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/42866886389.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vupekova.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=carpal+tunnel+exercises+post+surgery+pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a7ee8105537a27916327bbd2379eb7db/95895821067.pdf

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