Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb5efa484cce94b…

MALICIOUS

PDF

105.9 KB Created: 2021-06-25 14:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d8c1b590aadc521dec1f7b44c86f728 SHA-1: 33f04434206e58a02abc4483b41ff0686a6c14f5 SHA-256: fbb5efa484cce94b65de3ed134864fa8c14f9399ad661d8ba35c702d3ee48354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. These links likely serve as redirects to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/o3f1uoldv9o5bi0ar41c89e96h/lagikakorixemomexebot.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/487edabab70abe94f32e08807ea7e7a3/zarirugasagofukikon.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074b62a1fbd7---57903808009.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafab07e88a---50919312254.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f62c5b984156c66e13246e9f7f12c87e/36954279060.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/05701654c7ce4337ed373acfaf6376ad/vawigidegafedizif.pdf
    • http://ciskmv.com/css/file/fotutefak.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608052e74907f---14053582835.pdf
    • https://burgas-remonti.com/userfiles/file/63929106151.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cd1ca968---masepa.pdf
    • https://broadcasthub.com/ci/userfiles/files/firozaxewazekowedorulepum.pdf
    • https://landbondcorten.com/attachment/file/04c27e7d99ef463ad130dfa2517ad5e4.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4caa4df6---71847953640.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/146a60efba1038c3e7931dbce015ebde/fejopob.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b0df442b99e6a69df0dec795cc2b1560/kibatos.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/vudolivug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=occupational+therapy+functional+assessment+tools
    • 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_off000137a5.bin
aa6134e2414232ae22f0fe29cf7a7e0ce70f4cf53143b8ef368ebbf15888a367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137A5 10984 bytes
font_01_sfnt_off0001510b.bin
ac49cafa817771afffaab9f63a5de9e37d01df5d7a685403f09268082d5fd626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1510B 17968 bytes
font_02_sfnt_off0001806d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1806D 16792 bytes

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