Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25b0388c49ba3e8…

MALICIOUS

PDF

91.1 KB Created: 2021-09-07 11:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ee2ed6ce1f2ccf7f368bab7f8a5ffcc7 SHA-1: 2b35d7103164116785ae5aaba2c789b97f4fcab4 SHA-256: f25b0388c49ba3e883b7eca10247a58178e8eb9194596b07c3863d386fc48368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to host and distribute links to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lensmam.com/userfiles/file/farife.pdf In PDF document text
    • http://steelfurniturecn.com/d/files/fodaso.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210609_DCA1F5C2A682D6CC.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2251d5a78---papixidubiwi.pdfIn PDF document text
    • https://atl-50.com/files/file/dokokogoze.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/2725399308.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ca57ce35d93953222e419ffd948eaf6d/82516379728.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/21095861966.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/89503476882.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/35bc2aa45b1775918b668290fbef35e2/17798228652.pdfIn PDF document text
    • http://ciskmv.com/css/file/vozopopofezeta.pdfIn PDF document text
    • http://thuaphatlaihanoi.net/uploads/files/47869207716.pdfIn PDF document text
    • http://agama-rc.com/upload/files/57633621393.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/kalegili.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e8af9d137602a0796db8388b0dd3142c/xorotenepokijezopumuto.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/65790148853.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0c7391bab---20854238911.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/lelogefugemav.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/94840049667.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/fikepugato.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77b58660c---73020609054.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/patojimega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=standard+operating+procedure+sample+pdfPDF 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_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 11136 bytes
SHA-256: 91f5b8d45b8cd9eab8a9261a341c8f9d7c4dc32f3371f7ab9e7cb0686f581c4f
font_01_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 17376 bytes
SHA-256: 4fd774fcafa6568bb2bc296efe33e108eed235ea50545075bf7f7149213854f7

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