Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c36848f24dc11a1…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 07:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2243a0aecacca2ca8fd1fcbac355b77 SHA-1: e4913b6afdbf5f40d061ce815f3cc38c81f080be SHA-256: 6c36848f24dc11a1908f3a211b4da1a7fc6ec6bf65cd85393e1d09fbed1f3085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=applied+mathematics+2+for+diploma+pdf+karnataka PDF link annotation
    • http://webinaris.training/ckfinder/userfiles/publics/files/dudatel.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/79515075723.pdfIn PDF document text
    • http://benetalent.com/upload/files/62716287678.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e9446f8b85f---banelamo.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/78861085810.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f4ccce1cd---bazurekowu.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/23847275954.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/73042976570.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/nojigub.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/98092716989.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/nibarumigepew.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/tevebuwofodaranozubawukaw.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/mogekigepovezos.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/vawopidibipefefazipiz.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e4880fbf8---79225707195.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7350b5e51c5da3d4b4c1efc2d544d532/90364696886.pdfIn PDF document text
    • http://cycling-software.com/files/file/borebodawubojawep.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6fad293a---jajivemulufurogujiwewu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0e1b6ea7---50901629828.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jufiv.pdfIn PDF document text
    • http://dzbnf.com/upload/file///kalefujunadefazivuwixol.pdfIn PDF document text
    • https://eucolait.be/userfiles/files/69102728284.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_off0000be12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE12 11080 bytes
SHA-256: d2c1c170a6ab1482fcc0563a18c37618d6ec720eed557338b9496a1fdd03c7ff
font_01_sfnt_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 17392 bytes
SHA-256: e6a47a583d5dcb67ed392c8a6d7bd54cd6e275e50b20c609cf9af892b55c2bf4
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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