Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a1248ce0f73290…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 04:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea61dc8e1241869b4fdf7abb65528094 SHA-1: fe0ac77dfc58ce02302d8b60e45ae8c36ea507d2 SHA-256: 24a1248ce0f7329098e9b762c1f7fda9ca4fb96199651ed5bbe327173142fa9e
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 point to compromised websites. These links form a link farm, likely intended to redirect users to malicious content or further stages of an attack. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076822ebaa85---wamabomubemafonibadenore.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/44169660118.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/40202448698.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/22374272864.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/31719677843.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a49cc94952d0ac162ea7a9421186e791/44695058530.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/15282318369.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/v2bdcdi1o28f573a619nt7n7sg/sogorafonere.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/12342070643.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c90ab8eb2---84979317117.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/83281316433.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a226cc9f8f---22041890882.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/68120272908.pdfIn PDF document text
    • http://robbes.nl/media/files/34927738979.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/ec403f0ef4ca2bfda62e3ac86126a3bb/potoreri.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210817123022.pdfIn PDF document text
    • http://domplus.su/userfiles/files/lefimobujivufumezijimirep.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/jodawiberaliduketawiji.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/torisafekezik.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc0965bfc---59437578512.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/21232957814.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d16ab54ad95681f19f0c8d832ee308fc/nukoroluz.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/v01sm0t2rgoa8u6iqfuoa9np64/kutoxevemit.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/rokakekatevinilowubus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=database+administration+fundamentals+pdf+downloadPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/25295262652.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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 10984 bytes
SHA-256: 702ab9ff5aaf5ec15484fc79084b150b1de3b8fd68a6733e2486355613f99189
font_02_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 18480 bytes
SHA-256: 3aabb2b3179e4cefaa0163b02c466118ad37fa53b4a26924ebac63333e7f4089

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