Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57b67e2002a20b9…

MALICIOUS

PDF

99.7 KB Created: 2021-09-05 09:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc679e9fdcecb1c8362880da7f51a054 SHA-1: cb41552c3c7bc1f67432b5dc6a4f389a862a89f9 SHA-256: c57b67e2002a20b9a3c39f6b952901274cd37c32c22e07a559d6531463c8828e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains an embedded JavaScript stream and a large number of external URIs. The heuristics indicate that many of these URIs are part of a link farm, with some pointing to compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to lure users into clicking them. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/97827483785.pdf In PDF document text
    • https://mimpiindah168.com/contents//files/93824301934.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/32143505835.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/fanuluxejis.pdfIn PDF document text
    • http://abc-tel.ru/data/File/69024041970.pdfIn PDF document text
    • http://iviltra.lt/images/files/vurivafumikijufodezafad.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160738f4f21c7d---30477968376.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/32512221953.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/93260461744.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tm3k2k0rfcodlb9lsmvsjaeu87/83099188919.pdfIn PDF document text
    • https://biocoils.com/img/file/30245609700.pdfIn PDF document text
    • http://373113.linker.tw/files/lewokukenivixataxi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/25276089660.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/kogegejajofivimekabogizal.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb57ab428---kexiselikakaxidez.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a15dc65762---26345063192.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/dexoga.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/npmgh370f7o51p4q2n253huv83/xibubavekipid.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075900d2b080---87469952296.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210628_A2219D39FF089239.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611400be4e68e---55144495461.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/64583926272.pdfIn PDF document text
    • https://dintek.eu/uploads/file/37645734262.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2da465a678ed580c2c2e784c85951f2b/2452273775.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d7773d1f---rilade.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/u3j09mjpj3k219nfhkfjdkb90n/6972463812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=unir+archivos+pdf+con+foxitPDF 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_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001340c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 10712 bytes
SHA-256: 1e77405ba8aa1ce9a15f2ec70d28864116f5c712a59e60623cb4ab71fc16f3c5
font_02_sfnt_off00014ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA1 20132 bytes
SHA-256: fc37fa069efaf05a55fcb123aeb43d6a3e6d5b94fc4f78f9128fa9892e94db77

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