Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d4f0c5ed430441…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 03:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26c16702d0a678d7545f359db6d5ca3c SHA-1: 05c0808c708fc6bcbcd0c91d78d70c2b8cac5290 SHA-256: e9d4f0c5ed4304415bbf463d103dda75309c411a45fec8aef475f3868e055f8e
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 WordPress sites 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. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pointswestliving.com/ckfinder/userfiles/files/murovukaxasunozasexo.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b7366bbef3cd0590cef9ba40ef751b3c/53845613468.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/tazofoxowafowulire.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/mimepimalinenijov.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/73271873526.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/podulazufagozijoxotan.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/zemikuzevulurapabut.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/95226515314.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/21258860583.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/39831183032.pdfIn PDF document text
    • http://12shio2.com/contents/files/tatazarejufib.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/59213352223.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613247853de8f---86756890540.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/zisegi.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/31698958216.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210913002114.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/97204719268.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/zuzalewutodiv.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/xawero.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3db6e3c0---lenijunobojoseda.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/mudojevidabi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161300587664ab---sozalorowexivufuxi.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/newatelimepumutekisigev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=escape+plan+3+filmPDF 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10480 bytes
SHA-256: 09e35a490df7646e8c53753cf5d7c1268428add00770b190786e4779a6dd4da4
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 17276 bytes
SHA-256: 9383bf67a4ad1d307c0308f06b456278f0ed172ffe264efad8fa292772b53900
font_02_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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