Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3789667870fe3d…

MALICIOUS

PDF

86.4 KB Created: 2021-06-19 08:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c45d9d9b2c128dc5247ba2f8518988a6 SHA-1: 99d6f7b9ab46ee7182e724aaad93b880f5a650b4 SHA-256: bb3789667870fe3df5e8bdc0456ed581febff04815e7612157d89c03a3d8b7ce
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics suggest a phishing or malware distribution campaign.

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 http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a32042a90---savegulul.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6f14d6c8d9443debcb0c931ac970fd8e/45160825471.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d9bd3d0d9db277218342d2a05c89498d/27880252152.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ncl5mkij0o4mcf2quhialhmj9b/91737672135.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/e307f3ed4bdbe22b9a19bebaaeceda04/57553994148.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1778eb91---49391946196.pdf
    • http://musiclivemarsala.com/userfiles/files/zexovu.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2b4774c5840ec4e26f19aaa5a20a8db2/2612589301.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5cae3e2e---94686554432.pdf
    • https://vsetinrally.cz/userfiles/file/77844888757.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9f2a1bfea006f1e221abe805201df256/94417681214.pdf
    • http://amirafouad.com/uploaded_files/file/44325306074.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/tumetufapuwipuwevi.pdf
    • http://technocom.pl/editor/file/52045725833.pdf
    • http://files.ibiza-ferien.de/file/76237850498.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/xenofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kinemaster+apk+for+pc
    • 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
    • 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_off0000f39f.bin
8c469ea5ab21e84848f43d22db2ead0c9fab754f93f94b6c0658d32e6c739a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 5164 bytes
font_01_sfnt_off00010519.bin
ad5022385325e732cbc50961dcffadbf02bc35d004292b8a595113af011523b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 20124 bytes
font_02_sfnt_off00013562.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13562 16312 bytes

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