Malicious PDF — malware analysis report

Static analysis result for SHA-256 106d1d73c0660959…

MALICIOUS

PDF

72.4 KB Created: 2021-05-27 21:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a53f37bcce6489f2b3eedc753eb0349 SHA-1: 60d43ea8a48b6d587d1e8592f97bd28defb68cf0 SHA-256: 106d1d73c0660959f1fe6a83188f82fa9ea48662189f0bce5a4957d82562812c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a 'browser extension/update installation lure' to trick users, a common social engineering tactic. The document contains numerous links to compromised WordPress upload storage, suggesting it may serve as a dropper or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160949fe68da5d---67862552575.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847cb98ba58---71239895547.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0757h70ijustg6vcdf9omus68/15286422125.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b37df1135---dipalajevamifi.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d1f2789a---48016637834.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5291e37e0---suniwalodav.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8d9e101dc6d4c5f265f4f809b58cbdf3/93038275217.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/8cd55ad002af6409c509c919444939ee/56603193097.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c0ec83cfe9320d4cef97c7c932843bc0/sosonixuduga.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083caaaa700b---sodogaragewalimesorax.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ea692a21b11de9c9a4304901cf28d766/jawedimoninut.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609820abbba85---64137132616.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k0oi4hdmln7abdvkt3l7dcmlg0/65957625251.pdf
    • http://daoltrading.com/userData/board/file/wolatamurigotopel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=da+befo+jesus+book+download
    • 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_off0000de5f.bin
41dd174f020afdde0d4166eba32d0e29cf4bd43e8362a7cb9e14d34d2b51557f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 5176 bytes
font_01_sfnt_off0000f031.bin
1f9584b54dbfbf806bb766c297aa339cfdf3ba4cada062dcb1ffdd03c1df60ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10704 bytes

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