Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d7b3924984c502…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 11:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ee67155219e25cf1aa31c81313cb595 SHA-1: 6640b2dbb92f29e3b3958d321ff563d8a5b3fe10 SHA-256: f6d7b3924984c502c6a0d6c178a48bd054eb1297fee4562c0107f131e28cc67b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, suggesting an intent to redirect users to malicious content. The presence of many distinct hosts and the nature of the URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/07933657dfb5617173a2df75fd1af05b/gepeti.pdf
    • http://skrabl.pl/www/rpbd/fck/file/4910074485.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c623ff21c5---sonisumifudapikevixini.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/m62erppvv0r73gko8cuol8pq93/dumifopemetuzojititesit.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078caf4e005c---zimom.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b400ee01---38945283766.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/073747517dd1648d2689d6f7e4837fb1/dijarurepomiziloxowamubuj.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d6960852f---15151493515.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce58c540ad3---72236111711.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/e663aa2361d588154de908aa4624f9f9/gowijiju.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90ca83ca6---47944642110.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5370d8cde5---durosazugazigudumogaba.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/gh721pc8h1t3cqv030fq89d9q9/zubapo.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/hu3daposfu68tvcifoee22vlql/ruwizono.pdf
    • http://sciattella.net/images/file/31498452684.pdf
    • http://congtydaihai.com/upload/files/dinisobogujovez.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe15633b9---64907886332.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/120716c52d4aa5e641ea62f5eb167ce9/98694913077.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ospvg90a2o8nb4r09ccjaf15t1/zafirorinavotebesow.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ta7nrpuh56rj74dosbnvrs4f7v/40395993035.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/54c4393cc0bb55af4d5b30b1765c0000/mejiwuguxedumewutejelawoj.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/81f6ba15cdc4451f7e142cc1b542cd03/logisasinojobukofopiwex.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e2be808b---fuvonamereguginobawuvodi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unsaturated+fat+diet
    • 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_off0000f3d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16792 bytes
font_01_sfnt_off00010be8.bin
00ca81ce564e2a5a9074636995984b983fc7ba1baf473330c39afe9883838728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 10288 bytes
font_02_sfnt_off0001232d.bin
388a2c25f2b3bf5b19fcb7a2f0b87a112aecfdacda658aedc11b127ce66e7771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 16892 bytes

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