Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcefb3f8b90028ab…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 05:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 212f4c26bad095ec5bd7fd1a2a29bf5d SHA-1: 3bcf844e93a6093ee13eb573657a5446f6ca7270 SHA-256: fcefb3f8b90028abd358d4b4522776de37b009a8e826572a4c0a7f024cb1cd18
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure suggests it is designed to lure users into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=calcium+oxalate+diet+pdf PDF link annotation
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/580989a78075dcd9a642f162b0f00880/41623852221.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6ee90ce6f6a568bc8ae6f50d4bb7c295/42471296721.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/bomakedipoteru.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d2bfbf856acb099eda4ba182f6420d0/2049420532.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d96756a54de---gexerafevubususod.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/suompdfkjqumgcm8b4q6e3p2fp/ruxat.pdfIn PDF document text
    • https://fallsplat.se/file/kavavilariraz.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/24430290755.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/90262688399.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/55975652454.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/bilelakukanupigevuru.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb1734470---25096126137.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/65271854305.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/bc942848acb74ffd2fcae4eff3070343/68605123767.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/tegaxepuvogigole.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/92380627620.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082c18e207c8---niweg.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u9feev8qitdnkeanjkkm7p3853/zitategelapimenokiwelene.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/11059301967.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/31976204658.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/vunaxo.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/kagidajigorigowatazoboz.pdfIn PDF document text
    • https://starbox.fr/img/files/gokezopeladujironedizatux.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/504ed9e40026107c721873eebcd35343/62469649030.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 18140 bytes
SHA-256: 6b8f98568c94fbed89671910764f15e6cfde730a7b1374bb59c72f593ea3623b
font_01_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 10644 bytes
SHA-256: a854cb138b073363630805590c60b45bc9f69eef0813c6321bb7011addb1476f

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