Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ab04804b58d540…

MALICIOUS

PDF

95.2 KB Created: 2021-07-14 03:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 12374d7240f113db938e051592c77c9d SHA-1: e10dfd5d52b0db6423c0aa69f0a6b865f94ff7ce SHA-256: b0ab04804b58d54051c6579e623e0f45dc55fa123cbdda16782c61619be65dc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and potentially disposable hosting. These links are likely used for SEO poisoning or to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://inwebjor.ru/uplcv?utm_term=chapter+6+work+and+energy PDF link annotation
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160882840ed75b---56784758267.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ugclnrb8dp767m2krre8p3ui5/29976172830.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae6ac9edb793a505a7fbd3a70cb9f035/pevuxi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094073376660---safamuvikanofag.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/lvmakbvlpnfm01jpgar58c74r0/18396345766.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca42c41eca---62634363306.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/geaegob6n97779n0qtn72pqjk0/82731331992.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe8cc57a0---fikupifejekukap.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/mowonowojomaxif.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/mezujivibukulojudu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcac28d6c---gurar.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/57067795572.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/ligilerorabivusulimogivi.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/82095410227.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/gakupaxux.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974e8adcbe3---3902864708.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/i414cbt2cl0oam96ctpvbrj7jn/9667324133.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/xififigirofagidogufakuw.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/043a59dfb81f099ebb009d2f9a79d2e5/roremolowogigikos.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/teporexisokejobaja.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d31880a5b6cbe22a021b4eaa3ea74a52/37572154833.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/tonixeguvadopilolujif.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607723eb09290---kavokuza.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc36e5526f---mitajozefegilagozuwinagan.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_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 10856 bytes
SHA-256: 0ab9b96b7628da902c0bad2f450cca667e18687d4556e0ba44ad8381ec1b8741
font_01_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 18204 bytes
SHA-256: 4b8527e7975aa73c77ced40192675066222d82b51e9fdffc206c80c97a711178
font_02_sfnt_off00015750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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