Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3a79c95eef56fb…

MALICIOUS

PDF

72.1 KB Created: 2021-09-10 09:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f64afd134be6e631add7962fac484c2 SHA-1: e4afcf1e6293aea08afceb21460064c25cbcdbe1 SHA-256: db3a79c95eef56fb7c6ab18f916fff59cd6ba79baa7e5e29c90662e8c8059a8f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. A critical heuristic identified a 'Browser extension / update installation lure', indicating a social engineering tactic to trick users into installing malicious software or revealing credentials. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript and link farm suggest an attempt to download and execute further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mayingiabao.com/upload/files/61386879224.pdf In PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/diwazog.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210903_1D381622C919BB33.pdfIn PDF document text
    • http://onelove.cz/file/dokitadezakalojarepaj.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/wigofutifenun.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/66908558269.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/4808551415.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca0fd5afd---doruwadebavamazazutuka.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/23062561473.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/73194413470.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/jaweguruzev.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/10358205135.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161364617607a7---4242870173.pdfIn PDF document text
    • https://alutat.com/data/file/durebegojapop.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/bagipewilixefozadakak.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2bc8cd4d---dijinepefojenikidamibazer.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/30791651069.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/pekiki.pdfIn PDF document text
    • http://elitacasa.it/images/file/75620152903.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/salav.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/gaxop.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/digebopiwuwosogipapadi.pdfIn PDF document text
    • http://eichler-kammerer.de/kalufasijosajojufapago.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/92288334050.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/muzojegivuzisoxugonorus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=old+vidmate+app+installPDF 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_off0000b935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 10424 bytes
SHA-256: 1a49421ab98195c1fa2e21a12dce197cfbd60bb180e8a199fc7cec7de0815a97
font_02_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 16676 bytes
SHA-256: 3029cb12246a2123e08bd408b6722c0b43150d9fc66cce91e7959632b76bafb8

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