Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e0a42e9df9250c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 16:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e6e2c149c7f777b763f5597151dea7c5 SHA-1: f7f3cea5a48b65dfd28e875fb7d5c10805e2f87d SHA-256: 73e0a42e9df9250c42f81f08de95f5b086fbfa1d03800ddfd9de11a49d00c91a
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for hosting files, suggesting a phishing or malware distribution scheme. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://seattlebestteriyaki.com/uploads/files/bulazexiloted.pdf In PDF document text
    • http://nmways.com/uploads/fckupload/file/koruga.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/59266497317.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/vufinu.pdfIn PDF document text
    • https://adikmanis.com/contents/files/vofitorujuwirewum.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161374de9641cd---gikemidogorox.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b3ed05bef6cbfda3b2af3473e20792da/86962135757.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/82552388134.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/duweg.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/nukoregolarelikaf.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210905213312.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/2856915121.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/kulekisarazew.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/vatawefusapalazesizivemi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/219ff32d676bf60a24562e7dff26cca1/75535438552.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/gubugi.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/nuvibi.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/19433762033.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/25809078015.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/bokivajisibifeguwadebup.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e83ecbdb8---puriguruludakaronaxijonox.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/72806712673.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/62602999513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=truecaller+full+premiumPDF 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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 16596 bytes
SHA-256: b6965c578664c5dd894f5eca8ef5d3392c369ad146dbf0c2aa43897dce0ad2ea
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 10212 bytes
SHA-256: 7b5fc9a54f4d7717bd2ce5f002219c889a750ca2935c8c888df363014938e41f
font_02_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1