Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76ffc7cd499c443…

MALICIOUS

PDF

89.1 KB Created: 2021-07-30 10:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a4992ef60371ba81e5988504c699ccb SHA-1: 36753562f8bbf02da871dd738276e7de1c55d8f8 SHA-256: c76ffc7cd499c4433f63ae9555033777af1fbab4605b57de5d6a77f5cd75a2f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/484d1e8a8cb4bc6f497b62c1eba3c998/getijamuvinun.pdf
    • http://www.neoneofitou.com/ckfinder/userfiles/files/dogafiguri.pdf
    • https://strategieb2b.com/userfiles/file/nanofavuxemi.pdf
    • http://velapower.com/glwh/UploadFile/file/2021073005534973499.pdf
    • http://thefjordbaklawfirm.com/clients/876731/File/45565352178.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757069b0ddb---xebelurevuw.pdf
    • http://comp-art.ru/userfiles/file/89518036194.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfb3d5ea9---66967582121.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/2lhb8lfhcuv276satestnmejc0/fepuri.pdf
    • http://kinocosmik.ru/sadm_files/82636248192.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/wufenebopijagesejilekaji.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/xizexek.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/fosudawari.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b82376f95a9623043ec15f251fad224d/50310051944.pdf
    • http://cortabellanews.com/userimages/63345674600.pdf
    • https://aksusu.com/upload/files/burexib.pdf
    • http://beijinghuojia.cn/userfiles/file/bugame.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b00ef248b1d---visizonifu.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160835597b599a---titeredavanobulerubusile.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zugerusedubivekixadivuv.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160842edde86d5---90183323853.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9235b7024---96309599720.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/76651237969.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/46818474871.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+use+farberware+pressure+cooker+7+in+1
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
font_01_sfnt_off00010ecd.bin
474bac62edbf104e10cf23c49840a2f0851e1a4c08bc03780aa2c8d57727a88d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 10940 bytes
font_02_sfnt_off00012839.bin
392c5688a9e254e725b5e849d18c982ec77c6b2e843a4aaf3a475ff10dc72d83
pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 17380 bytes