Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6af36a81ed7a95…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 17:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ced026ca008f013d4d70081a5a0e4808 SHA-1: 6e80e7fc46756d6c2b73f850d9261efcc909ed6d SHA-256: 8d6af36a81ed7a95bf3a20bbb03c2b995c11caf39fafcdede29ce4f965d61f92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=pigment+nephropathy+pdf PDF link annotation
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c1177247389---83484524908.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/vafotex.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9b0b9d991477317a1b892ebb15f9d2fa/39281098423.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c62f9c8585f07bc295152b6591fd5865/wadata.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87c8ceebd---dolozinuvamip.pdfIn PDF document text
    • http://garderoba.sk/images/_file/ladexiremulibavet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903696a3fb6---vagibasisogavefeji.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/echs4n6gfesincq5hsv057vf9k/renabiganikajelabeseteni.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82ea6a50a---79222203000.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/90791566491b69ef2a0129050cbdbb10/97716270441.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4033f711f7---83177630589.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/54601595710.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8eb05a74f---12260772813.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/37611307045.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/87d667c8b820bcdf613eeeec7c52c5b5/66674028128.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e46a0252---zisasis.pdfIn PDF document text
    • https://lesura.net/userfiles/file/dasar.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/53585470114.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16100a37e28336---xuwakig.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c84d35bbf5aa0ba16c253009385d3a08/1173067927.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e03ff3c73---fepolidivetumi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ef66f6ed8f214d76328cc0ceafc9dd6b/gelafalilebajuf.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/vaferuwitatokuparijamabiv.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160927e3828f67---pofusapu.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/toloturaxomizegaru.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_off0000c50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 10844 bytes
SHA-256: d04d1c673901bfd49e0d1a77cf0b06034664a47043ca3ff5a7784a02acd7092b
font_02_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 17576 bytes
SHA-256: 76d39c82f99722748a13f9cf2d1169aed3a6ac5712c8a1a1c5b052c264ac95ca

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