Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf783d5b89d8f31c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 17:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8a2fdfc02a22c028b171673f8b42b05 SHA-1: e1d96c4766ebf135111694cc7c83fde6ba219c87 SHA-256: cf783d5b89d8f31c9e22b2924e1c924584034f0e0d22cf92d2a6acb3b1bbe140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://zekejozsef.eu/FCKfeltoltott/file/lusitidagukisamux.pdf In PDF document text
    • http://abwingsmd.com/uploads/files/91792121104.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/pululomodaponuwawu.pdfIn PDF document text
    • https://km2804.com/ckupload/files/29271664912.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7dc86582b---62131885692.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/nolob.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/daxegemuk.pdfIn PDF document text
    • http://wirheiraten.de/images/file/rufisujevirodu.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/miviloga.pdfIn PDF document text
    • http://bptramptour.pl/files/file/nexizovexetenevut.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dc720d6c867492af5073206f5e00e72f/8682220405.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/81741633288.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/lelenuwunudufuminovulokog.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/tatazinolexixuxixino.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/nunalemadijadigegedivipol.pdfIn PDF document text
    • https://asken.as/bilder/file/tolebinukerunebe.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/selefokiriwesogimoxoni.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613185115a74e---16560402008.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/dekeniko.pdfIn PDF document text
    • http://flirdining.com/uploads/files/6873678766.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/34182260724.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210912_A71ED4D936377AB4.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/36430950335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=harry+potter+and+the+deathly+hallows+read+onlinePDF 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 10680 bytes
SHA-256: 7270b6428e01dc0af0e8bc75766461dd9542d9f7aafce1d2dda2008fdf35f935
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 16996 bytes
SHA-256: 1012a5eca60a4030f505d723ebccf42431d433392a441e3bb17c9a7a32247d13
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1