Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7ae7128661815e…

MALICIOUS

PDF

85.8 KB Created: 2021-08-25 03:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53e9b524ab998f293d3f87417bbe10d4 SHA-1: 0bb36b05cbb50a20e67595ab87b38f71d12f7e54 SHA-256: 4c7ae7128661815e064187bb77601315e269b15919aabaaabc6fee834f9fec5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious browser extensions or updates. Numerous URLs pointing to compromised WordPress sites and disposable hosting further support the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=global+privacy+control PDF link annotation
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2bb0979d---gufuzajipajizonero.pdfIn PDF document text
    • http://stonebreaker.at/nugisob.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/96da3d458be3dd39a65e8bd7f86d86f8/31379513599.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c50327bc8b8---5861787483.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4abad86e6---viwolosokumewa.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/namatadagobegixaxemuju.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/213e1b4e53417ad3c42793a2c2b5044d/41703729990.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090540f59987---paxaderunonupomelig.pdfIn PDF document text
    • http://abnicum.com/files/file/58374878594.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/11237497511.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/zedakovub.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/57l0i8pef4jrjm0kot9vn976l3/7914679927.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/redoxufarakigizemojubo.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/nm79rjmcnuiu1en7f9nn9vdm0e/1861541850.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/23458428939.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/89394137266.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b663a384a69---gofirud.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kuganadupivusenav.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/bajopol.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7f4de5aaa2dddec318ec06558256cca1/wamiwibiminalixejisaxad.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/15012158185.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lt9c9obqv6l2oca8viuog2moej/lolefawibanitonujufate.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/98741410301.pdfIn PDF document text
    • http://beauty214.com/uploads//files/202108130819367107.pdfIn PDF document text
    • 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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 17348 bytes
SHA-256: 13ab48a79a685e20ede3463d2e4075efe191bcf1aa3b66fe8dc63b9cc5c63e9a
font_01_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 10424 bytes
SHA-256: 791ef57fc269c85c3a8753caba0750c09224188a17a4931cad4fc783d7dcf07b
font_02_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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