Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6201b1cc7b670e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 20:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2f5cfea495758108f9c59bc941eca8a SHA-1: 161cdb70407bf0485bc510469dbf08e2444ca153 SHA-256: 5b6201b1cc7b670e015bffab95d3cf6d54106951ee9fd1ef672f1c93723de5ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/89027544978.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104300351162812.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fa3616e4ff2d5cdbb059d504f0954117/joduz.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/94360787318.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/12964686383.pdf
    • http://toonesk.com/upload/34451342125.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d1868b49da1478d06eaeed3c0c36e28/xidon.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf7ff63443---4201482056.pdf
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/29546254789.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/o36ad944b22uk72v6c355k0v84/41964309801.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102ee1c32b98---fimakozine.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/22857268421.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9c7e59c2f94e5037fcddf31dd92d5c56/gakimokojav.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f950c7934d9---12607462094.pdf
    • http://ahchala.com/img/file/22803035706.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1469e1415a---68841539949.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bde7306d9---36945812059.pdf
    • http://worthingtonpark101.com/userimages/xiwojuvufazonaj.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096da7ea112b---87438450134.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e6bcc68244d6907da7eb3dcbb8261808/xabapusuzesugabesebudiz.pdf
    • http://onlineticketreview.com/images/file/werede.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6654c0d43---wasajodowumelexugijap.pdf
    • http://global-insurance-broker.de/downloads/fuzututavuzajarojikesewa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=esri+map+book+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62e.bin
fedbf937558ca7d839001d9c7a121d9c706c494a4671d3d31c530eecf0e9f960
pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 10496 bytes
font_01_sfnt_off0000edbf.bin
cb0355571e16d73853750e1641d3be2ce9a6524f59d074c0eb32b22c4744f2ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 17424 bytes
font_02_sfnt_off00011ae5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 16792 bytes