Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbed4bca33060241…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 21:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc2be93405aa675e743c55d8d928dcd3 SHA-1: 9655081e536e17392c9e7626719dc273852a3cd1 SHA-256: cbed4bca33060241bccc1691421bd5138849d966a64c29167c35ba37883f68c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=social+dilemma+full+movie+online
    • https://aronabritcan.com/userfiles/file/xonipibuxukibiwakirud.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5545979eff8dd1ed51d1627c515f2530/40715162077.pdf
    • https://aviatroglo.fr/IMG/file/ziwilunitabuvatabotur.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210919073004.pdf
    • http://restaurant-lyons.fr/userfiles/file/tumazakejosufejepo.pdf
    • https://inprovitmexico.com/ckfinder/userfiles/files/suremubobojekaw.pdf
    • http://confidenzacsapagy.hu/upload/bajitakegejuvitela.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/fopibijudidino.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4692f25e7---xuvitilar.pdf
    • http://clinton.abwingsmd.com/uploads/files/xewogejobar.pdf
    • http://adidravidar.com/ckfinder/userfiles/files/laditu.pdf
    • https://stepweystudy.com/ckfinder/userfiles/files/tizabut.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/37263099471.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/61669315246.pdf
    • https://hoatuoi360.vn/uploads/files/4895496520.pdf
    • http://dagmar-e.de/userfiles/file/nuzudububeriwesova.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f0ddd750f---52759369704.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/55120269188.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/zimomagitopovapolefu.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/s894h0tac4f1eehdtbd8m46lpt/19885006982.pdf
    • http://yuhongzg.com/d/files/88168948357.pdf
    • http://gzperson.com/uploadfile/files/79999143876.pdf
    • 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_off0000aded.bin
ab1e58512007fc571c5c2cc4bd309a6ba686afd0927ec6c2b53b3b791f22ac8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xADED 15532 bytes
font_01_sfnt_off0000d556.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16792 bytes
font_02_sfnt_off0000ed6d.bin
fb4b1a799b1ec717f0741502f77ba907b4d41d961ba5a9d9eb62a1a52d4f3c49
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 10512 bytes