Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc8a6418dc10e54…

MALICIOUS

PDF

74.5 KB Created: 2021-09-27 05:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a7aac7f312d97a49bf2896c6682dfa3 SHA-1: 462e91dd6d6cfa1a34d750643a5b9af1189e9ca2 SHA-256: ebc8a6418dc10e54280eb769bfa1a2d28066e4353f884b47dd0a7f3586956e65
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as a lure to direct users to malicious content or phishing pages. No scripts were extracted from this sample, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 5

  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3bd08ef97---34792806881.pdf In PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdbad31aa3---pizawonirosibumurevo.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/5561179200.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613151576da23---nenabipebewupix.pdfIn PDF document text
    • http://tzsunup.com/upload/39861469856.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a83d6bda---4566243160.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/18727937347.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/jibajapojujoxamagudo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/19639310426.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/xosagituram.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/zeruwuziganukowa.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/vofujojaxukuperunatikabuf.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/rotulazijuxeraxeporanow.pdfIn PDF document text
    • http://toonesk.com/upload/25580331249.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210911044720.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/xegonudajabekegikajutebe.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/kuxebetojolevuji.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161307da8db977---11425658615.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/25767197525.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/99662524204.pdfIn PDF document text
    • http://inistor.com/ufiles/files/zupafuwivijobadoruvasiguj.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141226babd7d---litexot.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/fazoxisixixib.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vusazukuxasafasatebowo.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/wapowusadogepumanovikelax.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/7onrcag0o61l1r99vshcar7o03/pofanitivopenetebev.pdfIn PDF document text
    • http://pedraferro.com/files/files/4764126502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=otg+software+for+android+apkPDF 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_off0000bbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD9 10828 bytes
SHA-256: 0c24fc3bfdb1d6207658ce33b61a080893dd2e58346ffd61e18b05147af7eadf
font_01_sfnt_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 18176 bytes
SHA-256: 1250bfa200501e19ce636966c2e058ab17111f9879757d192e6db8b5c37e9291