Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b927e1cf9aff49f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 13:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41beae2ff13f33e8dba5ca8e7c006b8b SHA-1: 562e0f3ff9db271f70e8562626b5b244ecf3fd65 SHA-256: 0b927e1cf9aff49f7a06b5c18ad1ab5cd99aef4c1dbc0913e797e9b2991d50c7
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and heuristic firings strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6292

Heuristics 4

  • 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
  • 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://crewmak.ru/uplcv?utm_term=colors+according+to+days PDF link annotation
    • http://corporatiegids.nl/uploads/files/vevuduzalisezefuzijexu.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/qq0v32ebbfo9lbilbr8n273t73/menasipupanogijemimivekek.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/firisuwapejemeruku.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/noget.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/tejowi.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/bizadamuxidam.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/93806517105.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2fc6eec7bc57d8460dd099f5020f6b4d/kalizoxujazenozig.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7984d68bbd1aca8d61c15a11a753cff6/lidovupozojunog.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/43c3d396f17d11377827b293e35885e2/89803782120.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hg905ssqimbnikn5ttc76aotnu/60080557271.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/86994317969.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062706114458.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/18933123924.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/74950489953.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/90450314911.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b575706f032---nudirejikisonamadubi.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70ab35719---60216873495.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bfc5998a85ff9407926fbcb503ceed58/dufopajofajapi.pdfIn PDF document text
    • http://kotolantopeni.cz/file/37184087500.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca37b520a4a71d83e5be2357bc8f3df8/zijorovajoziketopi.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/80100032780.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/37s2g7gsgvkmdaqvv3m178f2jt/20490863986.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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