Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb16b29c363718e…

MALICIOUS

PDF

71.4 KB Created: 2021-05-10 02:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e05ed3cbd68940e8560abea0c5a7607 SHA-1: fd8b8a3534336aaa259648259ee8116f03f70c41 SHA-256: 9bb16b29c363718e7c5b00a7f501acaf28d821f6d7aff4c98092fb57de5e837d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The presence of external URIs and the overall structure suggest an attempt to lure users into clicking links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://catamma.ru/uplcv?utm_term=chrome+json+formatter+plugin
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4a2057f56a67105ff1d684cbe0294151/92816060776.pdf
    • https://arvikabc.com/images/uploadedimages/file/91209594399.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094ec7b6b7d7---45994948559.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf8b50686---piraguliwigebuluze.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/jjgrf9svie6pee8cnl4r8emjdl/dekomitozuz.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9qs8ioq1jfdddh9ccjoeq7qs0o/11656151050.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160785ff6d0d97---60910829221.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083120581771---96157716675.pdf
    • http://amandamaitland.com/images/file/rurinosogoxixi.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/s6mnmvtu4rig0f9kilbg4d19j9/11886301251.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf3a4eb16---dijazikipowonipiz.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b62c58f2---35894569839.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/4gsog32mn20trn2hu6shqbk3p6/28665010603.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_off0000d769.bin
915c11ff7be517fcb6758528ad5702ea5df04d0b3a0edd46bbe667a6a8b5b22a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 5296 bytes
font_01_sfnt_off0000e943.bin
bcb6a411077e745be11768586a6900d00f3b31af584a8105ea32f7bb4318bebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 11664 bytes

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