Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b9c2b8dbbb01c9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 17:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9022866767181fe89d2b53a12aa4704 SHA-1: efcd09abd1c9a97f88b84466affade658fe15684 SHA-256: e5b9c2b8dbbb01c9c12cdcfb46dbe76b036e366cc9b9c0fc90d4ab5503f1267b
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with multiple heuristics indicating a high number of distinct hosts and links. The ML classifier strongly flagged this PDF as malicious. The presence of numerous URLs, many hosted on compromised CMS uploads, suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc0c06167---pamifulujefemidoborezilu.pdf In PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/mevitisenokizeme.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/62539000846.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/59810285073.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/nedupakujuwuxalotite.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/65694001383.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/15099534576.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tazoxafun.pdfIn PDF document text
    • http://askaudit.ru/price/89666382392.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/simelipaxizokejaliw.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/4f12eb91b4eced4cd0cb3d32ba511664/nirozapivotesiguminolepus.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/355422309.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4f0f5b2f8b62dcdae4c38b7f0d2a5c74/vesidiniroto.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/61993852331.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614203be26b00---58225761900.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/wexifozufevolug.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/61714695628.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090819125463.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26844071230.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135020474fbc---73005953604.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/35332310328.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0d7000db---xoxonanafisokarerolamovam.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/84547133179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+crew+2+download+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_off0000b29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29C 14680 bytes
SHA-256: 7ea895f0092cb17f164ee80bb48bef16f5ce9f853964af9a2f8f4d9a234a9257
font_01_sfnt_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 10604 bytes
SHA-256: b46828698d45d9cfb4b12edd5de6109a96d9cf1e01d7f4c947442a721036b936
font_02_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1