Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c333eee44353bfa…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 09:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 586830ba1216a6ba69769c2f1ebf2da5 SHA-1: c53add5b11cf7f9ac1f36480e20a7a5269493994 SHA-256: 8c333eee44353bfa8a3bac2c2df0587f105481e448708e40042101d24be150be
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/zemerufutexexibopi.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fdb88c452---8537506044.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/femobozowefewe.pdfIn PDF document text
    • http://hanleyresources.com/images/3003428917.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/japazasurusuriwen.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/46a6ff46790e34e847c7a95caca52001/35834596892.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/99859163303.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc449d175---75652700786.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/28872914165.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9c4b3ba5---48676298324.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aoj6nl7o8asava3fm3geh0pqf2/zofuvonorafizifemad.pdfIn PDF document text
    • https://ahha.az/userfiles/file/fabalimakifiradunajixo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d20986d89d---20975765919.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7592108430---40012227138.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087da2bee725---xulapalolesusebiditufeje.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087833614f50---bawigeralojirugabut.pdfIn PDF document text
    • https://soechi.com/userfiles/file/mefedumimizenovagibube.pdfIn PDF document text
    • http://goldmustang.ru/files/files/vegakerufulujoxirodozu.pdfIn PDF document text
    • https://thehouseproduction.net/file/bixip.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/jobatanatifuxoza.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/87835350110.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160774ad9da627---sojoxoxokuvawibin.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/76566236899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=manual+do+roteador+arris+tg1692aPDF 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_off0000bdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCF 11024 bytes
SHA-256: 873d191c2a8d0fda643b66a89c87de28f9fdc383db00321fe9c7b2c19b4470fd
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 17804 bytes
SHA-256: 12640dfead8cc667f2494f83c446a8e5fd011d9082f90c90fdd1d71dc6153b71

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