Malicious PDF — malware analysis report

Static analysis result for SHA-256 017f7b46df4c8e94…

MALICIOUS

PDF

79.0 KB Created: 2021-06-24 01:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49b4e8efc33f971b48b2456173643eaa SHA-1: a803e1262a12a6ca8f9d08b88cf14ec60f6cf64d SHA-256: 017f7b46df4c8e94c3ab86ed40c78b4cdc7170366221222b60de7a2c7b800612
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://beachfirebrands.com/userfiles/file/89148648504.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c364abebb3---tedenuvepewu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gatva0hkrb85254nc7uolbn0p3/tozexukedexafopepod.pdf
    • http://anhopphat.com/uploads/files/vezelewipizemepobufavo.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1c99d52e600ee992edba247d8e5dd9a1/2950604274.pdf
    • http://www.anclupnapoli.it/userfiles/file/57408022109.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c79860b84---davaluzelafefej.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba09fba4b4---9375944003.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ce609e0a8275907681911952493af184/jafekovativov.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b720a2dc3---vibademadixipisibagux.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b296626b51---94861635328.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jlr1ds6fegvqvu2s95lnt4obsr/56611818597.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/dcbe2ca1733fb6ba3e36a7379ddcbf73/13250131199.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbd2ee149---97936549730.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb18b7e4c7---fadepekuwumu.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a81c38e42---jotimixejonir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=asp+52+engine+manual
    • 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_off0000f36b.bin
4a3a7a7289f15551cb04b7dfff9a8841e789dc6e72bfad31ac98b766cbb523ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 5288 bytes
font_01_sfnt_off00010564.bin
a6e7fbaccb15881a4988885869923a6b068424363c70f2723b6d2e3d6f50a9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 12796 bytes

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