Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebf69c787a5a619…

MALICIOUS

PDF

96.8 KB Created: 2021-07-29 20:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db21e438f16820a7cf9129ba28bd0f49 SHA-1: 261e96ba549b953cdb277da0e7e20baed9f5bbcc SHA-256: 8ebf69c787a5a619a897413043f7b6250658cd8364d6d4ed4d304175d00dae3e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly identify the link farm and compromised hosting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5375f6c679b1d8109eaafd94c37f4cd7/kuvoxogitudojegir.pdf
    • http://lab4050.com/upload/editor/file/felusuj.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4aece028b5a85b685aee6907f6e8f8f9/zamunelitizepudowofoxa.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c9a982696---fotimoxepegu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6ea04fa01630329974600b70d9e5e89b/29263054348.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/a2da5bbec8eb82cbf58dabdc360f71e1/73348785135.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607455c14d649---77040872255.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecdcf87ca7---xakutuzekokab.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b11c401ee88---99373968166.pdf
    • http://apsons.eu/files/file/30582700423.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5223b6604a---jepozudon.pdf
    • http://boek.se/bilder_umeny/File/lulujarivibaxija.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f57338f17a---kexivexiranejinifagirik.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca99bcc2a6---41481222963.pdf
    • http://riggi.ru/userfiles/file/98343088312.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/be95563332cc8070ece06af47d9b5edc/3234065297.pdf
    • https://gegeny.hu/uploads/file/96390541096.pdf
    • https://childprotectionindia.com/lexcyberia/userfiles/files/vatikigabawexarevepevak.pdf
    • https://khambenhxahoi115.com/images/files/52041051355.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983df2045ee---63266240122.pdf
    • http://donghotam.com/luutru/files/retobametujopokibar.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e25cfba3e70e8645b8c504064856eb64/nakexumopakoxavosos.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160957d1bd39cf---jabar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ejercicios+de+configuracion+electronica+3+eso
    • 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_off00010ef1.bin
5e3985d379de201380c4c507b06b6c6a47f1b243df3584639c8e222f68e9e587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 19832 bytes
font_01_sfnt_off00014227.bin
61312292640d0b5c1c836b8f60368d670c3d36818f877c1c8b6f5651945a1c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14227 11036 bytes
font_02_sfnt_off00015bc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC0 16792 bytes

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