Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc368ccd5083fac…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 21:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc060a2cdbf2a4925c11b3c57d0c775f SHA-1: 1e4c7baf7fd498d452e04053d1c2f4d82cded16a SHA-256: 8bc368ccd5083fac257c861586effdb97ea6a0a69928a4f58403d01c9461dfa4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://alexandrapanayotou.com/web/images/static/file/bubuwilokula.pdf In PDF document text
    • https://antae.be/app/webroot/uploads/file/zikumuxusudini.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64c0b59ee---tulanizisomidadipoz.pdfIn PDF document text
    • http://chapelguild.com/images/usr/masiduxerewafogusevij.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/32847262511.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2b0ecf51491edaa261e524a6adf53228/61063815475.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4159a9727dc9eacd238fd2b2e7c0d904/sawabuvagumupidi.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/r5eh5jbpj4rpol6gt3achp6kof/vowetab.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/snq1a084kvuufma1vcgkg0nbn4/nijava.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/dae52cee66f6c53f56de2cc400b89558/58382403170.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0a3d9c8535dc03d9f371e8386cfa79fc/rarimopizenipadekegivisov.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rikerakilivuwuxevop.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/ligeri.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5f94b607d---8888297176.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1065aca732cb9f388b3ab546ef1dda03/dixijirawotapafel.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/66343049243.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nupexirutobetufozojapi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0f481b5e08155d34304ca0c94969dde7/luxojugoluresovirid.pdfIn PDF document text
    • https://mollis.rs//files/tilujefowe.pdfIn PDF document text
    • http://teifsepahan.com/files/file/losetani.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/tozusokatijunotani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=extract+text+from+image+python+onlinePDF 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_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 17616 bytes
SHA-256: cef206c5a7b5033ffe13583ffd5758789bd99bb97187860ed2c501fffb410e6c
font_01_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 10956 bytes
SHA-256: 7f924d6fa897fe4163e14b340c4abff11321ad5f5e199d322bc00dd5d40a944e
font_02_sfnt_off00013aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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