Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bd4f75a96c617b…

MALICIOUS

PDF

48.0 KB Created: 2021-06-20 20:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f37dc4c15385a358d1a2eee8c925a667 SHA-1: 62a36907c3119baa0be622c54706187ac00d63f3 SHA-256: a6bd4f75a96c617b70caa54e815eee0edb802ea80a48af65e4c7977c5c3b48e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host PDF files. These PDFs likely serve as lures to trick users into downloading malicious APKs, as suggested by the URL parameters and ClamAV detection. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9335

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://catamma.ru/uplcv?utm_term=fake+gps+joystick+and+routes+go+apk+download PDF link annotation
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a99e9aa73---92026600755.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160835275d87e3---porufu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f72e38e7f---19933143194.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8e9a9b9269e738db791275a023062741/31873451200.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160829b4745089---doraxokalepobareruf.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/12339760168.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/5869726474.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/jatorivufadabeda.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/91ad75795a85fed42067e24f40d9530b/37079208531.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/74focou84haeokic778l5nc595/puladobetagega.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/062mon3t0m3nmckcnapvl5naj0/53875921541.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5b296f7a---63673275961.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080609935891---rijonukobudawifog.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5nj9g2usl68np2grc6n6r27uk8/78170443792.pdfIn PDF document text

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