Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39d93ac217c2e68…

MALICIOUS

PDF

98.4 KB Created: 2021-07-10 00:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fe3591c3dd935dacb73e1c3828a216f SHA-1: 8e41c25f151fa485d631ebfd29ab4a973b268812 SHA-256: c39d93ac217c2e6836a50086eb0acf2de2d02359ea79d309430f5f3d105f7318
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting sites, many of which are compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves directing users to potentially malicious content via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://bakoca.hu/files/file/kolopexeworukoluboxa.pdf
    • https://medius.sk/userfiles/file/vuzapuxezen.pdf
    • https://seerupit.dk/assens/file/73652715747.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/zubuloduso.pdf
    • http://x04ydivan.ru/userfiles/file/89429721291.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/23178270739.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dlg5cpgavfokvka22te6la2rvv/wajolorelobimate.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160796aefbd680---bororatagomedaniloxemif.pdf
    • https://pasarangroup2.com/contents//files/joselofid.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9n43e0phfpnp840rd1ur1pem62/gubofegobajuzutavet.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b47f1c241---16830360147.pdf
    • http://inglewood1968.com/clients/68690/File/79453413433.pdf
    • https://dichvuketoanvn.org/uploads/files/6436416909.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3fd7df3b---leremiwodezevitafegu.pdf
    • https://matskaren.se/anvandarbilder/203/files/72576533143.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ksj9rc57nkhs972csrn285q4vd/80041767127.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/055f683db6a3c7bf8ca3dbe3e1d4e3c6/82136439016.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qnk0qnf31udobmghqu23cr52us/fizaxenagokubazimerefofid.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c01f766f6---lenolejizukuxewufugasow.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f8e28dba5778779ca01d6be6b1d41735/43807041402.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad9e0f0bf---30570129674.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/m17pse1i0bhjs75o65dpp658a1/diradusogax.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7028df29f0---93971961277.pdf
    • https://ilcaminodaugo.it/file/rekikonipigex.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff8a88449---10631244997.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1991e78a84---57793957475.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8b74e304---27759654514.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=i+never+dream+that+i+love+somebody+like+you
    • 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://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_off00011bd8.bin
deefbe48acce6da8b5b3e375008b10fc4e41b019cd51073cde2511a29b473c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 10976 bytes
font_01_sfnt_off00013523.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13523 16792 bytes
font_02_sfnt_off00014d35.bin
bca8fc642769db860b9f8ad6134945186da06ac42c95dafb1f257cab45da7835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D35 17172 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.