Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ad0383d4905905…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 18:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f16e347a5f8950ad5215d43cdd4d798b SHA-1: c18de00d359198a8bb8457003d2c3f982e6f9085 SHA-256: 00ad0383d49059058d82b3b2704d3d5e19fd09b1a836ccdcaef4da580b8de1c8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting it's designed to lure users to malicious content. The embedded URLs are likely used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cailux.lu/userfiles/files/pukesuda.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843806c1bb5---2347551441.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c6d687598728632c981508cb0a15f5d2/rukumikagitabaj.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/sasurasekaxekil.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h3rnjhisf1cvurmmrc0gl4afr5/ponupasezibazugegu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f40be86bb---44367143455.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/27258118824.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3k22bbskbav8262g7msfpcs602/jatolipinevofu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610674ddbdf38---82931682238.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/31288476398.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/kitudexesuxenosopeme.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/75061089740.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/76715738735.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/bemidudagakirekafada.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/43688966862.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/duzomaxobenabaganalorigel.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/35332420720.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/58429510947.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vuriruvepenaxejezoxexaf.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/45441104507.pdfIn PDF document text
    • http://billsky.ee/files/file/58704488979.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/39b169a1cf52453f8111f240caaab735/vegosizifel.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/fetomadigefiwuna.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098409884f16---96312068928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=well+control+calculations+pdfPDF 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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 10704 bytes
SHA-256: 9ec26396594752075020f09d19d80cd6dc1cfc0fdcd7f1503b1388ce8c8a911c
font_01_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 17308 bytes
SHA-256: 6653b23f57456a5f6bc50c13bcf1910a44f2f7087b4f27d5945230bc64abba1d
font_02_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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