Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee97e57a734bd54…

MALICIOUS

PDF

105.8 KB Created: 2021-09-07 18:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 888031b268e97a78b27a8f50f7a75209 SHA-1: 64159100b768637e8cea6f66f9e3272f4534cce8 SHA-256: 1ee97e57a734bd54280ec83b3c44f2f39cb686c078df34bb7c956b363611dc96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users. The document body is heavily obfuscated, preventing a clear understanding of its immediate user-facing purpose, but the overall structure and heuristic firings indicate a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cbb8a184dcabe8827606df4f1aa4675d/53811014877.pdf In PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/6619157999.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2e51b3a8e4139344f87a3a39bffb750/19472623228.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b6bebf88f805a93dc227f837ea0955ec/65649077374.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/8109844073.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/74668801881.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/57032080920.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/23539610704.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/62862202620.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/rudabawiruribomiko.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/vososaguzefajel.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nipopu.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/nolamifija.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4efbe7471---14313310415.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/09bb6615077ac8ffffe86d0a0fc0f4a2/92376204187.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/1859754643.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8995a7069---64171541987.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/f1notl76p3focv8ksifh1s7mpm/mavoluxojaku.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c089750cd5ad5f663de02e74d306fa2d/21583844565.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/gugek.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/78782996662.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/23061828401.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1292c4da086100f05c9eed3b0f9bc62c/sepikix.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d233cfdf5f4---91453557269.pdfIn PDF document text
    • http://parethumukalchurch.com/uploads/file/2662823111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ate%C5%9Ften+g%C3%B6mlek+sadele%C5%9Ftirilmi%C5%9F+pdf+indirPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7E 11248 bytes
SHA-256: 0a1bb0affdacc758cc3031ea216d96361cd7b3b29c1a0db325d193d5fd547d78
font_02_sfnt_off00016522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16522 20584 bytes
SHA-256: 535d19b8f4a59f5d07b1006e5cdbf00f2e2240cef423ff5a6c5e46e4fe66dba3