Malicious PDF — malware analysis report

Static analysis result for SHA-256 2953b18d4984fab3…

MALICIOUS

PDF

81.7 KB Created: 2021-08-20 08:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5ff095564ab6c8fd8b69d48edfeb77c0 SHA-1: af85c511e8bed44ee700efae4364426f2fab7fc2 SHA-256: 2953b18d4984fab348ad780f0e5daeb3ea434cbbeb8c82cab4c44de69cf14c82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=war+thunder+dog+fighting+maneuvers PDF link annotation
    • http://asijskepotraviny.cz/files/file/25498833536.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160856097240a6---46811141166.pdfIn PDF document text
    • http://kgmda.com/upload/files/84763004186.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/zivajawik.pdfIn PDF document text
    • http://toroisg.com/public/images/files/kobexanuvewesa.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160889d5a352c4---foradabisodabixeva.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/nssit7s6cod1ic94glmtvd9ctd/9963455278.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/8139d2a413728a3292c70d2ba8284d50/xesot.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/nulopowixipexujewujil.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/55579392324.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/82ab133be62d7e64a73dc3bc8ae7118f/34499882925.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160af8f0e5acee---siwudigilonefesik.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/vamubet.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/34038436853.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/sexiwusuk.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/98958831903.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b896c1be68b4468b47f65c6e3ba612fa/semifarulile.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/12584673076.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/22181159579.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/tosufofadaberopibaguli.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b95676969---92086751535.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210624031756.pdfIn PDF document text
    • https://immobilgold.com/file/39450413197.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/wanoledutajurejo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 10916 bytes
SHA-256: ad29ff6e9b3cd7032daaf9306437ddbb4ae823d69712387097e4a89986318d80
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 16700 bytes
SHA-256: 75609069e385debc277d6d2704977e857ec5363ba261e97792676e23c82595af
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1