Malicious PDF — malware analysis report

Static analysis result for SHA-256 60dbf0c6d7c9a662…

MALICIOUS

PDF

74.2 KB Created: 2021-07-03 23:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 687621550d1331f04cc9e329a81e0474 SHA-1: f529a411cc1eff74b1e8b5aaf1017f2431203d0a SHA-256: 60dbf0c6d7c9a66274757fc5116d445759944a7ea49e88ee2278ed89f415d92c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links align with techniques used to host and distribute malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160840bbb20794---tenoruxinapozabigasaja.pdf In PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/butanesuronez.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ajnu0vruf5scrskor945evkgm6/14295376922.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/58874111046.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/tibivikivimupusenadeluvug.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/41529530212.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/56896642944.pdfIn PDF document text
    • http://sam-global.info/files/file/59841238026.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/96054697890.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/60375844992.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/j0n4g70fa9omm05acur9pacf18/nelurutudamidupuvule.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3acd0d160f95cf0b1a0fcd14d952c3fa/89645788929.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/25f8n9ot9v6a4fuh3ms6fhrk0g/80011003505.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210529034621.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mqcrugqkle5vqjffmi82t28307/tobukujubera.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/88ddc73d6e98bdd4089989906dc4052c/96768247951.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/aht25o51f041952dat793i0hi5/kogijelo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ddd73e1651afa82b060d8f6344b3a03c/23970231846.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o75791shag3bsfgst6hlhmna51/relebi.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/xuromifenunu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59fbc778be---77293840358.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mbesdl41v1ammeiea3h6q554d3/tilonarenefomiv.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/adc07e3be2b764208f5f3458a3dd9eae/76739885737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=twin+lakes+golf+coursePDF 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_off0000be2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2E 10652 bytes
SHA-256: cc8a081540353a3d9f81526a404d307df62266ee0c0c163e7f8748ed90f574df
font_01_sfnt_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 16748 bytes
SHA-256: 489a7bfd26337ac08da2dee003f9e0bf8c5998e4d8ac3e419fedd3df440d4237

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