Malicious PDF — malware analysis report

Static analysis result for SHA-256 76992b8f4245ce48…

MALICIOUS

PDF

70.0 KB Created: 2021-05-17 05:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 118d809d87977af3321cd47af0fd5e86 SHA-1: 131a3351f22e01d4e4cd99871e0c6adda7e4966f SHA-256: 76992b8f4245ce4825963bf680e3af569b948d9340ca0c2a9db2cf6696c4af86
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to phishing or malware delivery sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6c087158---jonejomop.pdf
    • https://chaplains-camps.org/upload_picture/file/fitefepikodigudugo.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qlc76p5ub0igo85q181366pic6/reponomowoxugejike.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/h8o71ghnf2nd17cak30sfcst7g/86703685622.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/37201e493ee4e6eac36a41384f3b6394/65468180378.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/k6ge2nbqa6ihhpmqaj4gn23h38/kalapokir.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/fp4gl6sinqbhplhhadqfkvqgok/71531630598.pdf
    • http://fine-cottage.ru/userfiles/file/rakerokimokopilipusanaze.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609708f155831---59235299187.pdf
    • http://yuha.be/_files/file/korinateworenase.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940af2ee5b---femojowimeganatade.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c7ce13da---31090250232.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608516333e678---wojebopunumaganuletul.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085670125898---20944245569.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/uhadm3qdmakv3vikra41njf2ha/69367757383.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/76390455116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bronchitis+acute+pdf
    • 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_off0000d6a8.bin
0aa49da8bc0a0a3b6606d4cd78f71e8d735fe7d629dfc58fc95bee68a98adb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 5260 bytes
font_01_sfnt_off0000e886.bin
bac5aac2efc3d18ea4f03bab4ab8aa522e45c5fa8591cdb2bc469cd4911235d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 10224 bytes

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