Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7d3065206ebc41…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 08:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 783253c66303901fa4475abd470a0eba SHA-1: 5ef9ed185c5a4f08483cd87f6f625f9a10185624 SHA-256: 5b7d3065206ebc41e486a944f05a5a1339a82154d37d3f77849d56b9148ff671
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct traffic to potentially malicious or SEO-manipulated content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=hotpoint+ariston+stove+manual PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hsti728nfu8cb5jai8g8nribh7/nijajuvigigopetimivozum.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e39bddb2---favajukalilimipidefa.pdfIn PDF document text
    • http://derma-dts.de/files/file/xipumeladapajavirijefitu.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/bogoxokapuni.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecc7d01926---nejuf.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/10185446227.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/22424721765.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/755e5009953886761acb29d5c9a6c343/buvivuxabakaxikexidod.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/65735639630.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/pugejumisu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d298cf292ca243a4c6fcdc55aa1b61b2/85243674441.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c9c777ccb0---mafilikelufeto.pdfIn PDF document text
    • http://patroha.hu/file/8687416631.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/rarodug.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2df2f9e393d0a705f5ba5a684c48d1a0/81993077942.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1625706196.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baa11b82ab7---pividugojolijetuzur.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/mojepuwuxegebifukazej.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7a5532ba4---ginetukezakimezalaxo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ggr4jcssrd6asgc9cnh3t3mah1/wokaram.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf63b07bf6---givoxomab.pdfIn PDF document text
    • http://standardamulet.com/files/files/jutameratexegenedogosuvi.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xonugudozorapuraxuru.pdfIn PDF document text
    • http://kids-ex.com/11585732220.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/7020ff7d29a96f5f1dc4af2bd6928c91/xogegaligamopizul.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_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 17596 bytes
SHA-256: 588ee19120ec389dac61498b90018851902bf821cba6259907f0c7c095358add
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 10572 bytes
SHA-256: cf7eb9980596ef7e2ba0c65cc7ff93389fc7f8b6b06b041bda51d2afcfc47881