Malicious PDF — malware analysis report

Static analysis result for SHA-256 8126fdbc0dab1bff…

MALICIOUS

PDF

94.2 KB Created: 2021-09-06 21:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b8b202ec08a75a9602a25f86dfe0b27 SHA-1: 2dfc31132851754b15e02453e6c4377db0aa1fbf SHA-256: 8126fdbc0dab1bffdba819713af2348c788215ffaf0548b59f209a57b8243527
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d96bc0a726---8821415679.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c8da96d1f5b201dcbb5c9b03dad3d57d/lisotazizirasurifu.pdf
    • http://apothepharma.com/upload/files/karilezejevam.pdf
    • http://tycoonmedical.com/userfiles/file/20581603463.pdf
    • https://nada70.org/userfiles/file/makezukojivisuwidus.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160792ac2b379d---86668604838.pdf
    • http://melly-incendie.fr/img_db/dopevofo.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/gugezudugutoxopegipib.pdf
    • http://kleiberit.ru/files/file/wevawodup.pdf
    • http://megalaserasia.com/upload///99470269287.pdf
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/2837074503.pdf
    • http://gwhs79.com/clients/867100/File/kawafumobapakozojudalad.pdf
    • http://novichiha.ru/pic/file/8870792590.pdf
    • https://gmnavarra.es/ckeditor/files/42088733961.pdf
    • http://posicert.com/upload_fck/file/2021-8-4/20210804040618692753.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f54d5ea40d3---85319726284.pdf
    • https://bouveau-consulting.com/userfiles/file/60168948868.pdf
    • https://tahubunting1.com/contents/files/tepefinomube.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7b995e5bc---34705227286.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9cc7895034257d9721266e0c594a4339/motelafikobare.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/vabugalaloxotatenoni.pdf
    • http://devison-matras.ru/upload/file/vefobapaderevorapaf.pdf
    • http://s-moonlight.com/CKEdit/upload/files/nibubolagaxodukuzawevajo.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/mufozuruwizutokezenuwope.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dreamweaver+cc+2019+tutorial+francais+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_off000105d3.bin
852668a6981208c664e85ebbb3a252b69b2c6bad3b82d53dd0d2e5fc2448038b
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 11496 bytes
font_01_sfnt_off0001212d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 16792 bytes
font_02_sfnt_off0001393f.bin
3a4b4a4d34e70e8d36ab7a590c7067c60572613e900260c16a7e21484540654b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1393F 19088 bytes