Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2d47b5034580cf…

MALICIOUS

PDF

99.2 KB Created: 2021-07-31 08:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 27e047d0f12981c42985688accf356b8 SHA-1: 7274baf74d911d4d78e51c06f327bda49d73473f SHA-256: 7f2d47b5034580cfb2e069d0d0bd10639ebcd00ec3f2c47a7dc23a1da95e6cc6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several heuristics indicate that these URLs form a link farm, with some pointing to compromised CMS upload directories. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6235afec8a7fbe15f62f4d0d2dea3694/71526098075.pdf In PDF document text
    • http://scheiden-maassluis.nl/uploads//file/10606264169.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c4f0b56c6---79333022782.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/nurorumesenewe.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/xiwajiduduw.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/74897304921.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/fonorefutaraxalolim.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089062e34e42---janokijokijojobobeturew.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/2667991129.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4395a15e9---pasedutufar.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/45378871145.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607181893a6e1---22655434479.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b461ee00a9---5943942749.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608409f19a43d---kijix.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb29f6b7b0f---36470659838.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/mavipatakexi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed570aa68a---sovepenujede.pdfIn PDF document text
    • https://computerzone.pk/file/lawatijat.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/15682264175.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/bubexakipujinaf.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff8bc0749---69262965671.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/86275633015.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161047e4d978bd---puvukuwivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+need+for+speed+heat+on+pcPDF 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_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13585 18388 bytes
SHA-256: 7246344322328a63c1c697b58e836f8a4e796fd11c21b09d9731b1cd99772198
font_02_sfnt_off00016617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16617 10700 bytes
SHA-256: a43ae5a60759796842d5e00962ff43ae8c54ba80cc7fbe57aa0158e450016463

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