Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2ab443d928276a…

MALICIOUS

PDF

85.7 KB Created: 2021-08-31 18:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3874bf649c46cbb3d52fcd1213e6924 SHA-1: c49a2f1c38dda05de1fb72e19ab1f4cdc9dfd27d SHA-256: ff2ab443d928276a562ea27666cef0b441ac44dbea6cba2c3b80f732b1a83f07
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or directing users to phishing sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b435df54bed7e16e57805d911b71db12/67066563107.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0d05c5a91---90769490289.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/18370405726.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d4dd327204f3636905937390a505ed13/sakebivadufifusoriwi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/82750111093.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/49250403518.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/solaguvaravilevogeza.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/99864260828.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/77c3cbbce7f93569f2aebe99c76a3bc9/32596577483.pdfIn PDF document text
    • https://mmszke.hu/files/file/vixeguzurivimuzibow.pdfIn PDF document text
    • http://dgjst.com/upfile/file/zokusow.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/lulazu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/87c8cf59d8d2be9fa9cb284a4a6cbb9a/bitifolesusivojovabogidal.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/lagenukivakujevan.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/19715781241.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36b93bb56---nimusixofadotape.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4bbd6e75a8830bf1ac5d4353be3582f4/39928182413.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kdtt3tk0liu3kicn6ke6p221e4/fozolakagupusefaju.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/vaxafu.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/dafusu.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/wesujirifawa.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/66866898450.pdfIn PDF document text
    • https://ksboutlet.com/file/files/55636008317.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/470965809.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/2e9d9681a9fa4c329c9dee13ac54b0be/6798716356.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d059c0c6f---53779984811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=snowman+socks+with+ricePDF 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_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 10704 bytes
SHA-256: f7ca83072385f15f1341f2ccbb01ec1dd653a3883cced1737e30341b7b1b4a61
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 18232 bytes
SHA-256: 467e9be87715543dcfa7c106ffac178b7880ceaa876f464827f0cbc5546a6eab
font_02_sfnt_off00012fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1