Malicious PDF — malware analysis report

Static analysis result for SHA-256 288834d6242a3f6f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 14:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 435a09ddb28baf763c89709b6a753c91 SHA-1: 7fc6984d73312a3b1d3adc1cb454b645a1ea9c9e SHA-256: 288834d6242a3f6fc24a7ae3d8963f329e9d9d73df719ee54e5a4479eb4b202e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=paediatric+bls+pdf PDF link annotation
    • http://theorientgarden.iorderfoods.com/uploads/files/27348863988.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/labobefu.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/ruzifamubog.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/kifixadoxudupe.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/0kfr0fir1k6m2c52p4iisj9da4/70416677569.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/gatiselagiw.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4d10ef6ca4107a6aafaa7a7e5d73dfc5/jupoxowewukezavexugegak.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f2f3a75da---riwokaruxetozoxisogogox.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1934c47a9---xanegorejakax.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210815162143.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/91305455581.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/newameb.pdfIn PDF document text
    • http://seamacros.com/upload/file/94580879957.pdfIn PDF document text
    • http://quetthe.com/upload/files/97892388597.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727475fe30---75060550692.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8df509c68f---981429036.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/62740558271.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/60403255381.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/wikenibezuxoremida.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f6d6674754b2841f47d55030243bf379/72059767428.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/dc3ee1090a9a4488d3f53f272cabd077/dulinezosam.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3e24dcb5---raporilibetipekewekupew.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107241722544113.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kafatikolidun.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_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 10528 bytes
SHA-256: 97ebbf26754cfb9db3cf6457f9021f7392473e517c70e86344222ce92c0cd953
font_01_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 18260 bytes
SHA-256: b91c1dfc53109e46ca5bf225e6be8f13fc5f8601d43f9236d5f919f6b51eb9dd

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