Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a75fca485aeab5…

MALICIOUS

PDF

104.3 KB Created: 2021-07-28 07:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 0f5480c2d8abf9557a1c320f6f673672 SHA-1: 8c3df545193ef3c8e74d77cc232ec71742a46488 SHA-256: 98a75fca485aeab5476efd2ea53dd4e7a1d6a71f7fb1e07c0b8a423d0b923728
136 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 6

  • 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.
  • 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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf536a6c3b---43629808786.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16070149db6b4e---xogexekubanupisafebape.pdfIn PDF document text
    • https://kar360.com/resimler/files/73708720373.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/6957eb87f62520a98d04779326acb37f/vajolorejolusedalobipexob.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2b503884---437160677.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/22538601503.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2320b0530f---25957944421.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a67791f8---58364131747.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/f9feb7fd2f273081d43905ad1711a7b0/23473904860.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fikojunetileselesupel.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/90242051271.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae1ce80b5---27664342138.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9717d02fb---lawomipag.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/tebufozapitumuloloro.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/26099015471.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d9411075f1b3887b725632728586d56c/5309215494.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b06e34753---dofanamoxufijazudapimaw.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/32364a90a3bf121bd1030f5c27a72dbd/jipebupek.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/xutazorufuposojak.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/mulosujunosozudopifizafol.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/dajija.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/17d3ce8614212b4293f1209513846f34/zusewikumumegojez.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/f66bmddfd8e66d9jnnbu1p7s3i/dinofanilefugipoji.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5863d823da---20062226778.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3db52f4e---gavenesogi.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7311306536.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/27584338285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+go+to+netflix+account+settingsPDF 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_off0001350a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350A 10688 bytes
SHA-256: 6d90ed9c69a4d9176380b0bc9904a636ed55152ae15b17cf1be9bd2581cd53a8
font_01_sfnt_off00014dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBF 17468 bytes
SHA-256: 30056b5ec434671fa33d3fb68d6546518bfe47f21c9a9fb70949af741e4f3106
font_02_sfnt_off00017b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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