Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd9b143cbc10c66…

MALICIOUS

PDF

75.1 KB Created: 2021-05-27 14:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c23a8eac8aa0cfbc333d7f09db1fe208 SHA-1: 36d7cefd71328802dc31a3757fd99e10cacad73d SHA-256: 7dd9b143cbc10c66b53405fcb457345d557b654a14a4ce99f8892bb691cec20b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://almondzwealth.com/administrator/imagetemp/file/dafetono.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607416b1609d6---xogujarevepipazajevi.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607315deca311---vijedafazunafoxeme.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3b7d4894---68306770496.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af4597611---54427773695.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e677ce911---fidixidovigepokewis.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b0ffa3e97665bd5cd08a20ed2015d9eb/turixudikofitebawexopido.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f548cc924f---74637494812.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e1a756e---28792213548.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a1c8a95a---42674405599.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2d0g7qirc2epsjst6qmaqsq5o6/73505214298.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607271de8faa8---dimodik.pdf
    • http://nessium.fr/userfiles/file/padajalogokodizibipalo.pdf
    • http://all-pass.com/folder/editor/file/99281016634.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d727640d5---41348424696.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sema+movie+download+in+tamilrockers+2018
    • 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_off0000e77f.bin
c68c47180c0ad80f42ac9d53330d6e721c065d3fa97cd139e6a33b68d0cb9783		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 5924 bytes
font_01_sfnt_off0000fba6.bin
097c94acd96247ec09c9278f554b66fdb49f4a07299764ebdee125f14a34e5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10432 bytes

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