Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff3fa3a83a077c3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 04:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b49dc5a48cd3534da746c9c03352309b SHA-1: 58a4eb36eef07903d89da61f74a0c84a269dfbbd SHA-256: 7ff3fa3a83a077c3fa5ca87ee64f561a647459fd6db021e705bb9e7f1c2ac8e1
144 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and a heuristic specifically flags a 'Browser extension / update installation lure'. This suggests the document is designed to trick the user into downloading and executing malicious code, likely via the embedded JavaScript or a linked payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gazdalkodjokosan.hu/img/userfiles/file/nawusewexesoze.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c86b434c---mutakuxalapozetefawo.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/60531748208.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901135619755664.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/gugigo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/279fbfc043df6cb01d49882101227a93/julifew.pdfIn PDF document text
    • http://vhz.cz/user-files/giterufej.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/18276175984.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kitomalor.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/90171982588.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/vonubapi.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/22511721629.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a5b792694400f05c0f0da16b330a6ed2/91836687338.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/47949015532.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335f3025636---dinisowirosuz.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/78805737582.pdfIn PDF document text
    • http://vinmexindia.com/uploads/redotokerep.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/52257758170.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/8687334170.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/ragozepilaxug.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5s7vfs97k0qf1ha089gi47pfg9/fibukimererakenaniri.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/04d5e1bccaa818a6fee2b4ecf211985a/kebasovebiwosoze.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/6228208885.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/63508829979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+videoder+for+androidPDF 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_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 17600 bytes
SHA-256: 7a8e27c0f90cb1f1ffdf612e982171c004cdc0c9daab3762ad5c494b14447745
font_01_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 10236 bytes
SHA-256: 7a66409b6e17cc2672815f7d1cde3c6d95ea822e7191d6a4863b156f2700856e

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