Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dc74cc4338b471…

MALICIOUS

PDF

73.4 KB Created: 2021-08-22 00:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65c67ae9590916125fb0a12e6d0b2e25 SHA-1: 0e69524261f27c76684930894bff7d07ab2152c1 SHA-256: c8dc74cc4338b47198dd67bfb4b70f7586312092a8fe6898b8d9b639b7ec441f
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic firings confirm the presence of external URIs and link farms on disposable hosting, supporting the conclusion that this PDF is part of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5471

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://greenmodels.ru/uploads/files/35962321329.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ac09b7eb1c28755811f644b12e1183fe/duwatemerimatebeti.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/07dc1d6435c4c679dad59383491ddd7d/93934644142.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ee9909fd6---xepipefalelopenudu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zepifatutupivewosulone.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608325e8e27e6---9281386398.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/594e2fbd9350513299c1c107e48fce1c/feguxewikeduzazebibavad.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1e30962b8398eafe64ce344989f52622/galepubenuzizakol.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/40b5ee67ff64307e3b09697f353f5cc0/7052845840.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fa1e9f941---nakilinafudapuduxoze.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/05m6o58ispj8c4c1j8acmn9dr1/63553671664.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919331bc454---44943198337.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/majekenutowem.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/kidevuruwusirena.pdfIn PDF document text
    • https://www.gcnaura.in/images/uploads/files/47116342534.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ae62532e1a8---xabowageminimovezefibibat.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/pewogutejukinogibejaf.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e103684c---jokaluruwadiwugodup.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/vawivafonarirafa.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609441a0b8327---66281008696.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/54232581234.pdfIn PDF document text
    • http://aimic.com/userfiles/file/66777596101.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/pah5gt8qgdb4e4hu2h53rcl720/43377228774.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/86253025084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=harbor+breeze+remote+replacementPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16296 bytes
SHA-256: 654931e6c844d8afeac167dcf8a3720fbb4dc99209d299857ecce27abe27b21d
font_01_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 10464 bytes
SHA-256: b8b6549724998a0033d07a70891edcecf79a70791c924eff088cd4360a86d85c