Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ca7a416f85084f…

MALICIOUS

PDF

76.1 KB Created: 2021-05-24 17:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77b3cbb85099c9b651fb99d8f4fece0f SHA-1: c26c1d09663dae76d7bba28babef2789c523ddac SHA-256: 97ca7a416f85084f60f015063ef0acee8ea62f0d6c644853e68ba4c1ba03fe3d
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, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and the nature of the link farm suggest an attempt to redirect users to malicious payloads, potentially via JavaScript execution within the PDF.

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://synerhu.ru/uplcv?utm_term=3m+filtrete+thermostat+wifi+reset
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dc7344563---1838044834.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b71cf3b9f---93230498392.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609817f20f000---51454797873.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3895385d8b---65691552942.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75fdaba3d---78511431104.pdf
    • https://mollis.rs//files/55800648177.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fab8afd0c---99962230520.pdf
    • https://ayurvedaemart.com/uploads/file/17754850093.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4cf87b07---72350551618.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4499318fcb0a9e85cf6b2aea297f9027/63094525806.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/90626400275.pdf
    • http://appletechsolutions.com/userfiles/file/202477118.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160830fff2cdbe---41046882700.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094037db0737---67864928845.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075989dcffb7---46342183904.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/fs6ok9pa26mf8s25is60ro4spu/rutonapaxemafolij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e033.bin
afb085edaa0dd24320e162f8e0d97a3f07bb5d19d79d5ef0b39689aef5a065a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 4848 bytes
font_01_sfnt_off0000f0ae.bin
c55406380cbd74ab45b2e924a07b5ea12585530b6fcbcc08acaa2cef62b00792		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 10544 bytes
font_02_sfnt_off000114dd.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 4324 bytes

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