Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a2bd3ce14e279e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 00:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c448e1a576e0ab16984fc89989560a1e SHA-1: bb66f6d17eb1d172439faf596f8b7f6194182ea3 SHA-256: 73a2bd3ce14e279e9fa8354935a7d28774df827d8ddc3ad6b08114b4fa44f020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=ice+age+1+full+movie+in+english PDF link annotation
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/6487334246.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210917155359257102j1hvvj2pygf3.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0d2a071f---pajukevavupibiw.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/72282150396.pdfIn PDF document text
    • https://ottopianos.nl/files/6255241644.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/13561216183.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/miraxekal.pdfIn PDF document text
    • http://evola.it/userfiles/files/nesewanafavolaziduwedaw.pdfIn PDF document text
    • http://4darchitecture.org/img/all/pomuzakes.pdfIn PDF document text
    • http://belniig.by/public/file/43203806956.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389dd65748---tobujajipe.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9071d1e94f55f8dde20474348cc5f3aa/27027058166.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161364f301d209---sifaratos.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ee49779f29259ca7cc6e31b96c51d39b/30139131992.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/48850994453.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/54781463268.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/nuxerilewotutawefivofu.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/93868191063.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/vulosilopekabenumakired.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/balasenozinon.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/94617219529.pdfIn PDF document text
    • http://offerparts.com/upload/files/40762282764.pdfIn PDF document text
    • http://guchen.ru/d/files/62102976187.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_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 10756 bytes
SHA-256: c3e2abc47be421a8499d8890fc71553f9049fffb76a000d3c8b9085ef57c2fdb
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 18388 bytes
SHA-256: 9e682f83c4f77ce50d33ce3c1139797356340cb931ffa685a86143da95e29976
font_02_sfnt_off000126ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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