Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1050061ff0053e…

MALICIOUS

PDF

78.0 KB Created: 2021-06-05 10:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e2e3e8fafe3b9bf2ac57a2bf56df56e7 SHA-1: da7f24a37afe71ef03031cc79a173fc72423a0e1 SHA-256: 9a1050061ff0053eacb63905b65e79cf547852edcd2c2407190bc8ea0d63ab8d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the links indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=sindhu+bhairavi+serial+in+tamil+full+episode+list PDF link annotation
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/c9bdpdt4jdn13aoohv0dku3vj3/lonulubunizalujoxenov.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e88e0ed724afa7270cffb68805a92a8d/90402209175.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626a7cc8e0---63471519636.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b220d5d0c44---65110646849.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/38c80c3a1ccc792345c41f0ac770fa45/dasuw.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b906ec9e594---tazenopogibobuzen.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/werabi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34b4213d1---58215505150.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983767247a8---58150769938.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/78072033970.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18ebcd872---17436354063.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d56aada1743cbb7057751d6251f6f69e/rapovonusimudukinato.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/karime.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a14f5cecdc8---95850277262.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a359b7410af---24508331391.pdfIn PDF document text
    • https://immobilgold.com/file/39450413197.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o526ha97ahbrornuui7tnd6bne/26595292705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 5584 bytes
SHA-256: 01f235f9800f8af4c9addde22541c1dc796c8b769f93c4f92331c8760a485342
font_01_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 5924 bytes
SHA-256: f9120b11359b22a2a39627e19d8ad1b082e8f724a6c8e328f1f7e70517e44f14
font_02_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 11264 bytes
SHA-256: cbf7b515313af1ec4ed446382c7a274757d5f1e28069a4755f29d112ddd7588f

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