Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb213d2d2657ffd3…

MALICIOUS

PDF

88.6 KB Created: 2021-09-16 02:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84ada650accd57965ba5f4690c505af2 SHA-1: c9b77f4673b1d9d0d175a25c5a8e07b1c45abc5e SHA-256: cb213d2d2657ffd3e186f25ed53a493e2158a971fffdc0bef76003e063a8deb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=blackberry+playbook+mit+android PDF link annotation
    • http://triple-a.co.th/ckfinder/userfiles/files/jikezulililanebilabega.pdfIn PDF document text
    • https://novitas.ro/files/32353127893.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/fetopivemadifiv.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/40722334412.pdfIn PDF document text
    • http://sgpeo.pl/users/file/88035986865.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/35774008651.pdfIn PDF document text
    • http://nawarashop.com/phya/ckfinder/userfiles/files/87371935061.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/35315543538.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/81932215498.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/bamivemujaze.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/davepinujeretujoz.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/xavamo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/87437597100.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/if542vhj8ur628bcgkrcjnrjc2/vumofezuxumewib.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312391f2948---48240829424.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zawisexabajoworewonixud.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s1bp4g0c1qjvp0amiqg2pco9pi/88130946558.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/vefivenoxafatu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/53470304587.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/19550701198.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/10075408297.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/46981272596.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/67476637949.pdfIn PDF document text
    • http://alkanboya.com/files/file///vujemisaxelapibaderu.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/76646949806.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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 19336 bytes
SHA-256: afac5fd05e4c4be3c02c257b98bdef3c960a2802cd14e3eb2adbf83803a61843
font_02_sfnt_off00013b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9D 10908 bytes
SHA-256: 30e0eb7ed0f674899de98e32441162fc3a78ecba4a976fa4e66f613347707222

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