Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc59f3a17f5d33e3…

MALICIOUS

PDF

96.7 KB Created: 2021-06-13 12:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 018f3465ea30b19e2b6baedb4b0d202b SHA-1: ec0c68da8fd7d7607b475ba0f39068ca63a60bbe SHA-256: dc59f3a17f5d33e33460c8d6d80a1def8bc0c4e2762772e8c2d30439017ee0d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://chcial.ru/uplcv?utm_term=xenoblade+chronicles+leveling+guide PDF link annotation
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607001a80b782---34746172815.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16097ffd1dff15---tebabazametabipegipipaw.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/27332450521.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62dfc17e08e0695270f39a5ee804aad8/fozumolenibapakuj.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac592a02edf---danukebojedowekadudam.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/17499455503.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e3jsrkq0rp7g1imnvkkd27j1pp/zidapojizelefi.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4hvuhk0kh2vg4r9vs20mpg66nh/74212828222.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0b0f911734aa5f939a764ec9d12c17e0/22668488091.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jlkhhqhbutd6f32l7hlckhfhc2/setopipogofufi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f63f32f75a---zelolivaliwobulukikobej.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/pabuvotewawubalulo.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/571143914.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/muberepawok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 25248 bytes
SHA-256: 2433714a2386ec459c75f799b79b0afd3b84c39a5196ec4c56e96e4fa98b391b
font_01_sfnt_off00013d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0E 5380 bytes
SHA-256: dbee6eb2ad9ee28c66e97e662fcfa454fea3c2fd0e17e4d70774a939072e7a75
font_02_sfnt_off00014f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4C 11116 bytes
SHA-256: 2dc28b2f2f78ddafde7c5d4fc256f8fd7ca4c1d9c59c3480b834cc236fdc4f1a