Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3de05ba15c0fd63…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 18:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fa6fb9005ba4698ce6d0c369743bfff SHA-1: e84741cfb32f34dbba5a42292ed6a469264efdd6 SHA-256: b3de05ba15c0fd63ba0a01151421f5ae887156d506b7e606f41b84fadb5d1438
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The presence of embedded URLs and the nature of the link farm suggest the document is intended to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the link farm structure is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=mars+and+rahu+in+7th+house
    • http://poetische-malerei.de/web/editor/files/83124086315.pdf
    • http://ever-pioneer.com/upload/files/53492549640.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608203986129a---pegosijopazet.pdf
    • http://ajtoablakcentrum.com/_user/file/6707426312.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68afbd3ab---ketum.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcb1316e8---liwenabonanevajofavoreg.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/0e5bd5629c780376df9a08d027fa4ed9/finepelifiweteda.pdf
    • https://ebooksweb.net/files/file/bixesutibemij.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4dd70d64---57310048036.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6c3d101d---lepabepamo.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/zoxonumotopabepasiwini.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608028cb9fef1---41956677915.pdf
    • https://btcauction.vn/hinhanh/file/bafixanufojadovatujoxipix.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd817227aae---tofuni.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c1cba821---subumopinoxufewekoreso.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a530fa170aa---70070622065.pdf
    • https://acronimocostanzo.com/userfiles/file/91138005529.pdf
    • http://sklepjola.pl/userfiles/file/71258179961.pdf
    • https://vijyaiprismcrm.com/userfiles/files/pobenagojogoxarezorifov.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878a85d1106---44566653870.pdf
    • http://wirheiraten.de/images/file/jatowoxivixarawewov.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1365526041f751ca8cf9ac71a526d5ed/47741484946.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/358fa5463a6c77b94ae8577c287830ad/63606605273.pdf
    • http://amsasecretariat.fr/userfiles/file/ligilerorabivusulimogivi.pdf
    • https://anthonygillant.com/userfiles/file/letidu.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/nofj0efim7o61qaodghvq1f89s/vusuditagonowaka.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 16792 bytes
font_01_sfnt_off000104b5.bin
c5fb638cec27b3937a95ccb29254ea21fadc09df6eb8ddfe91e7bbd37efd5e38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10440 bytes
font_02_sfnt_off00011c5e.bin
694e06566b6fd5c2e2b8073a261f0cbe418635ebb2f482b1fe0b24e00cb5f555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 16156 bytes

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