Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b580843f776774…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 03:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b63e90a8ed7720c797a070fa37c50513 SHA-1: e26957c7be743a00943f138fc5085dda97dc13d6 SHA-256: 15b580843f776774dddaaddedbf6fe6cfc2619b7ce0e9493428771db53535c24
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious. The presence of numerous links on potentially compromised infrastructure suggests an attempt to distribute malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://anmoul.com/userfiles/file/10954899118.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/fp0ov701vnnv607ur7eu7uh3vh/71868618416.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/43e66f5407f9c809998c0dc731bf66a8/12522553609.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/26e28e351b3f7f013f44cf151ab0724b/3720673875.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68ba5d9d1---2768648852.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6e6g8vactbpapmjnp71vqf48q6/xapovog.pdf
    • http://hilltoplancers1975.com/clients/13753/File/vofodoxekirexofa.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ck1g2in787mq9kpsd7tt9el3ml/tofezadabama.pdf
    • http://rotarylaspalmas.org/documentos/file/80712113386.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/016fd5337993f61728e789537170b6d9/55452945797.pdf
    • http://memoservicesrl.it/file/pujonudowuvofuvo.pdf
    • http://moje-stranky.eu/userfiles/file/nujafuwopow.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889418d3e32---zenek.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d1b225b5---towotalijamaxegofiduxu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c99eb7905b---46075163298.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7e3b711a---90156833296.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160755a245e3fb---lozibigimi.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303a82951b---tabulif.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790010da59b---57357822600.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52ad8e5cc---44023698665.pdf
    • http://airfa.it/userfiles/file/vekajajuxoragotolefidaza.pdf
    • https://caffedisanto.it/file/61906282163.pdf
    • http://farmaciafoglia.eu/userfiles/files/23353907398.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160736a269883d---xiliwo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dogs+for+foster+near+me
    • 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_off0000ead7.bin
d2e57814d98151a206f07783a5b3a58fee91aa21eb21f73731600b8a0f47a675
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 16936 bytes
font_01_sfnt_off000116f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 16792 bytes
font_02_sfnt_off00012f0b.bin
d74b94ed3ac62673015ef500edbd95a04424d38533df645b0b5bf951956da364
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 10420 bytes