Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ca2adffd8da9de…

MALICIOUS

PDF

78.4 KB Created: 2021-08-14 11:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ba386add69da11f0a1cd59fd1746ff59 SHA-1: d5e02ba552c4fedb4e3d012e4b513ed5b94f2040 SHA-256: 98ca2adffd8da9de0208f455dbd8c02cdeebd8e4ddeeb187279a9d2e0c63c9a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=lengua+sexto+de+primaria+anaya-evaluaciones PDF link annotation
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607730b1ccaf1---satesekevitot.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/83124651249.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2b1d859da65fcf039f87bc494b1a6210/27912277511.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q5qvmm8kblsnphr7rq3ebiqfb2/xegopipekako.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/lekewopofedevoraropufomuf.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6oqg72iu825j6mv5vtmjfc0ue7/jowakonafepimufe.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/2193255234.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/balurekawigepenop.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a857e7dc4d8---1575488528.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/5352302387.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/kefapuxifalakimetuziva.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/xewixesorawatomudisosagig.pdfIn PDF document text
    • http://fotossc.pl/_files/file/ditezagigawuduzijokaw.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ve01h4m9lg4v0gt52jfmvkmg43/buzowipuragabo.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/28566070453.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/badifajimepebovakejup.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/856eef697e1f2b792d3a036ed8f6174a/23539050310.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/suzerobugomavut.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/ronigasobuzawigesef.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mpj34lrm3ra7uraeb9dtko28ja/vakekovejurever.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/xuwitaxetofaberate.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/bufelas.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/5k8r9r5adplso9gd5hmhv5tmui/86868685017.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/5498002100.pdfIn 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://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_off0000ccc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC2 11232 bytes
SHA-256: cfbd6581f0bf55e6f8233ec605ff448c3c60f2555b081f2bd77c463e533e0468
font_01_sfnt_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 17484 bytes
SHA-256: 642b1096c73bbc22794c7c9e87f61301c00bb8b5d0db29681de1b9e50d507acc