Malicious PDF — malware analysis report

Static analysis result for SHA-256 79373aa8d6582f72…

MALICIOUS

PDF

99.0 KB Created: 2021-08-26 06:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-15
MD5: 51bffbf8cbde4b9a8189d070fcc0f521 SHA-1: b578ead44b100b59a17995bf6226368e77cf8c78 SHA-256: 79373aa8d6582f7238c0fb2addbad4e9696fefdc2b40652d1e677b41f8d6c1a9
96 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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://comobrew.com/newsite/images/user_uploads/file/lafumasedu.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751d8197cb5---lojokedolumirolakis.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/sajolijonofugab.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/40e430c59e2e776033f2c2e6d0fa531d/89677237781.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/wusupet.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6159e2729---seribikekuxexitaxajoguze.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/58694693001.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cae536c4e7e4bb2c18ba294caeac7211/wetitotefivumawebujek.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab479c0f9b---15411422332.pdfIn PDF document text
    • https://rajakedua.com/contents//files/vogawegipuzif.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93c6f7af---zujazodemefokaxararu.pdfIn PDF document text
    • http://intertribo.sk/files/xafuvexuma.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/milopizum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf103cbaee---raripoxezetonowalasodot.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/nojedokejatejetof.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/wejeraxitizirikob.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/vebizuvozalutaralezivapux.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/naxuko.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/17138587466.pdfIn PDF document text
    • http://platcometals.com/images/file/24416446379.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/a5d391ca5cf37ed4e1e05319fcb1a719/gabite.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/n1m8tbkrtqjsotf25bmedd04tm/73871112894.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/14413138079.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/samakoladigegenew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=where+to+upload+a+pdf+to+sharePDF 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_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 18336 bytes
SHA-256: 9710ff755644d29c5b1401e0d2018bd738af17c2b2a8dc04a10bf51d50c6c7ec
font_01_sfnt_off00014d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16551 10492 bytes
SHA-256: 48dac65a9f827f7ca94336e315facecc2f3a6bd95f3ef3219b98ab120c4b74fb