Malicious PDF — malware analysis report

Static analysis result for SHA-256 8969c3abb6b20144…

MALICIOUS

PDF

77.2 KB Created: 2021-06-10 15:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77846450af3863c54332760078795fac SHA-1: 92a73c2ea23d2fe3447cc3fb7b155bcbbc6890f2 SHA-256: 8969c3abb6b20144d2580a8468aa23e93adf2c44ee0ced16d53dc824bf21360e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=vikings+season+2+online
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608243bcb7f3f---33868324655.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/t583oo66ar3cosugkv9av6gmg3/zesojabebot.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/i0knj487cnvheeq1l7vt9poeh1/84140514943.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d86b287f8c---gijanizelifisagiwunimedi.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/sogajopuxeb.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceafdd2bf9---62991644814.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7v91t7dabl52h6dasb6kgbjrd7/zakibawefubone.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/12d769951dbef22d54d3d6ccb95411cd/47548764704.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/84c948477d3f352ea12a2207a879a423/29326817719.pdf
    • http://accessprecision.com/userfiles/file/294848049.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b219e5db---mekenogago.pdf
    • https://adepotcustom.com/UploadFiles/file/20210504175641190.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lerimijupive.pdf
    • http://se-ty.ru/uploads/userfiles/file/4532321278.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/simagefufijuvi.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc1f339b8---jagifedubome.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa82e691657---jatolemoli.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9971a7874---muxipilekonepurojebemab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a1.bin
e647024f981d1989391e14b17af3ca533a79ba8b24a46e2f6af5f3401690313f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 4920 bytes
font_01_sfnt_off0000f683.bin
bbeefa95d04c8fb23d0f5f694d53f4317a98d15121e3c33581dacf84a7072e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 21660 bytes

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