Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c28eabb0dcb04e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 19:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5808749becd2b5c40bf45af2ca20866 SHA-1: d1d3370b7724dd5f7c09fd70ca38af97a8e54f45 SHA-256: 16c28eabb0dcb04e45d66fa984e6d7bba716530356b0f05c0fb93ccda6fd01a3
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external sites, many of which are hosted on compromised WordPress instances or disposable domains. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is designed to trick users into believing there are new or changed banking instructions, a common tactic in business email compromise attacks. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://plagij.at/ckfinder/userfiles/files/24291493077.pdf In PDF document text
    • https://butagallery.com/userfiles/files/80162530961.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/23443880464.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/xexuve.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/9188rl8o77jpoapa57q8f6cdth/47957861727.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/businiwitoke.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e69aa026126a454bfc4a3854bdd201a0/94615118061.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/45901938032.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/62756484685.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/12539650965.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/raneg.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/gonoka.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/nebejifetupirarazisa.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/69994384032.pdfIn PDF document text
    • https://atlantidegattico.it/file/54031216823.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/nuzufetu.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/xosonesisavupipulal.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/32372742503.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/37569601505.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/84377886355.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/88230401903.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/sowap.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xagorejawuzu.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/fosunan.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/47530479fb08628026fed87866699427/bimurofedarefenonam.pdfIn PDF document text
    • https://reha.bg/content/upload/file/97329149418.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/rukukudejaxal.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/82963441259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=como+saber+la+version+de+mi+bluetooth+androidPDF link annotation
    • 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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 18384 bytes
SHA-256: 3c52cd84724fb7895d9b150b12a4469a19e292d4ea9842944f532a6c39683d36
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 10852 bytes
SHA-256: 490f374bcf92b5d406e45bb20c9284236825c32e1fc0fa1385222da4f2c72c7d

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