Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d679af9f336b728…

MALICIOUS

PDF

182.3 KB Created: 2021-07-19 05:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dc9db7802b81571782f2612604e1861 SHA-1: 13f405d20ecaeb9afa9e15584c1ca712278afba0 SHA-256: 8d679af9f336b7289615f4f110b59ef252929079053c95ced14a9db5089c06a2
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 threat. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to exploit users via malicious redirects, likely initiated through a phishing email.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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 http://decamiones.com/userfiles/file/minuxide.pdf
    • http://buergerforum-tirol.at/file/sofoxadilamaxu.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0282aca7560c03e5b867735210f90389/kepitakupom.pdf
    • https://lbassicurazioni.it/file/kiberovibutixikegeje.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/37ae51267f17c8d4df20cebbc0ab9a54/beninotitemomaxibivupa.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2e213d3021e1a75ac75cad8a81d5dc3b/96555433870.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/jilekisekarijotexabijib.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da3d39913---94366376998.pdf
    • http://magogaralbamoble.com/galeria/files/8367771092.pdf
    • https://mmszke.hu/files/file/22059168764.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/jeufr16vqiuljcqm77u4ii12e7/nalozedibalogi.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vmp3gfi5d9gekqlcfd50lduq2m/nepoxonokezato.pdf
    • http://e-hematologica.pl/users//file/wiwupo.pdf
    • http://cnmrobotics.com/files/files/dukop.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/rizegupalow.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/13f650a4848363fc299000cb46ca6e79/fulujodurezofuvubixepa.pdf
    • http://ziconiavip.com/uploadfck/file/gubedelimajilo.pdf
    • http://hrzservices.com/uploadfiles/file/lidevodo.pdf
    • http://weingut-suppan.at/files/10067097137.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8fcac178---70630332561.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66a8d8b8e---28467801446.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=convolution+of+signals+example

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