Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd64db7ebf2d01ba…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 00:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a1dc710ab522a6628712a0c458a8ed0 SHA-1: a0a54a0f2bd6ec8f353a0f6bb15fa985f34414e4 SHA-256: cd64db7ebf2d01baaf3d1cd7046beefb5d2e3bc64767b23544bd059cf1790808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=display+broken+android+screen+on+pc PDF link annotation
    • http://sumosushingrill.com/uploads/files/wavolinumugax.pdfIn PDF document text
    • http://e-menu.hu/editor_up/71798301720.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/99881766932.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/74167086709.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/daa29164be25f53c1ccd752f33cf3426/dewerakimosi.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/21912544584.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb4c2bc89---78950474709.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16134d1a8131ea---59753761257.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/dipekuditavubekajexef.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/dajim.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/14360771702.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/pisiwev.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/21280012349.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/kafedebapova.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/faxeroratebodepajarosabi.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/sovifirogov.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/34688911670.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/16048274973.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/duxoxeboguluxupifipufe.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/jomabugevejujobebun.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/ruven.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/serolusewamiwirisusufot.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_off0000b9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E2 10756 bytes
SHA-256: 687b83e487d6a2cad32de8b270892e4c2f3147e10dd87a6f1cfc9291f10b81df
font_01_sfnt_off0000d27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27B 16288 bytes
SHA-256: f35d3a864f5d3d6327cf6127f9a6c0f869a03fb8e01f1a838470759025200890
font_02_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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