Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b16e80a03afa4c…

MALICIOUS

PDF

66.3 KB Created: 2021-06-11 06:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90750ab90ab9639a87f073521a0aeeb4 SHA-1: 5981945616541ca1e312a93d126b2db32bd2ae86 SHA-256: e4b16e80a03afa4ccb28e935f914734dd0c79441cf1bca64612c7b9483ee228e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be related to a worksheet, likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=newton%2527s+three+laws+of+motion+worksheet
    • http://talleresjpg.es/img/file/86889875635.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/64a89b4c1cdbfc59185424979d08fef6/65537784193.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6fbb2962e224ff96b4a5c94eab2b8e31/65682038527.pdf
    • http://campbellelectronics.com/uploads/jodexusagepokokazususevu.pdf
    • http://aldo-ins.com/userfiles/file/fovofobosilup.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c330b00dd4---20347673373.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf2fe35b3---weferebuvekovojonolugogon.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e91a7db362d8d38a994709c08e2cf834/22894330090.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2e0fb0ffe16c7b6445b19ddb00fe5344/gisobojilojofukejizogeb.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2gb9mgv0npdokm5demk3nt9jc2/83441336055.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7c481051---41612571659.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16071b3869b66d---petogulewuvufebanikuluxa.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876d240d95c---getefuso.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5915e5099f---73621518453.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_off0000c93f.bin
3f473ecb5acc145456bf7aa46fc1a0ae29b084b42ae15d64fd96f74d52369a41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 5168 bytes
font_01_sfnt_off0000dac2.bin
5a30cc6583bff9e1c0ac8dd74cf15a398f317858ce0ed9b992b03b273ba615cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 9976 bytes

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