Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62b57252f9a5aae…

MALICIOUS

PDF

70.9 KB Created: 2021-06-14 09:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7c2fe41b419b7a507e01da500ec7b1e6 SHA-1: 88da0e5d8a6f6b35264c0aafaca9a2bf53f8f5f5 SHA-256: a62b57252f9a5aae1354f0a3a1e53e73db1dae56b875485df3ce06836465a313
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution vector.

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://cructi.ru/uplcv?utm_term=dungeons+and+dragons+tactics PDF link annotation
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078add214489---64937109369.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/d420utnhtf84l42ko98d3s9bsb/bewudiz.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kf82tl4n8n3iejedhp316quf4j/7280903708.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/23eb3c77b57e70d9c6ee42c788e26871/fuzok.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7267692fef07793173d48779aa9585c/zabonibuzunowiboj.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef12ecdf45---4000477318.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gofozuzevexifokigim.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/litosutoguzulawitifut.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1757d190c71fd4b04894ca09be8cc3f2/zoxutiwoxexifuvu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cp1ul9gr6qodpo9uus0bf1ecpc/lavurujesoligigefatukeref.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b87e8171aa---zuzujaboxoba.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/fb0b90f4f0d7c7def42f6fdad2148831/48795616535.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e919de55bf---45228118838.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 5076 bytes
SHA-256: cd89fe133eaa52c7a6a7ebc3248aabc64ffd3bcadafb964a9eefb764229bf685
font_01_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 11840 bytes
SHA-256: 5b9d755553e5a061a65a99c3731ccc8b8cc1421d8c7299277f313f6938c3e1e2

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