Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb56ff9be94d3e7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 08:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9d42f36f0b5d1d728cc764c239dbe175 SHA-1: 50ab274559f976f63effb042da6d46d8e3a7e43c SHA-256: cdb56ff9be94d3e7c3956cff0e7f8427622ad06e791a95047ee7a4fe9601b523
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kite-surf.sk/files/podawuwijikuk.pdf In PDF document text
    • https://ags-car.com/upload/files/dotukuboleduw.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/97818825329.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/ravate.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/gutezamipupodowevata.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/xetatijuwofazusorowup.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/79c23e3776ba2972d83778814c0fed96/xavonasosonowu.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/fefewamuzenadeduzan.pdfIn PDF document text
    • http://geoman.cz/data/file/69654342115.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e412315051---gofopoz.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/pilapixisapimif.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/340b95a073cf8fca1bb8f07a66f73d61/81221753116.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pudibujivupupo.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/kanigipareraxize.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/fekopowitebetogosivozim.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/47183854870.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/fakoke.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/pitoxexuvizipede.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa76268e04---43749797698.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/lajisikosodoguwix.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614696da465e2---25873040654.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/78531753301.pdfIn PDF document text
    • http://unseretochter.ch/images/file/18384372275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gta+5+tailgater+in+real+lifePDF 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_off0000ae82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE82 10272 bytes
SHA-256: ded756ce39de22ceb8d26e58a6323e5e82242005a0f4b22e8e0938c476ba49cd
font_01_sfnt_off0000c5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 14488 bytes
SHA-256: 9c987860194c42a56018d735ff203d0e35f1c5c87f56d16f37e65a8b87bbe322
font_02_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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