Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee9419f4cf84171…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 00:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a0d7146ff486cc3c534fbfd1f5d1357 SHA-1: 6d012802e9c7f0f5a1122a8cb443aed4b731706d SHA-256: 5ee9419f4cf841715f1c5e34d2a8380c8225037a17fa6588ffcab9d0f2674535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=notes+on+periodic+table+pdf PDF link annotation
    • https://vas-vill.hu/userfiles/file/mawox.pdfIn PDF document text
    • http://lscapital.it/images/file/65443101277.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d5abf3a5---66699926323.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/zuzopu.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/sufubo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf74ce161---8655986627.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ct3glqjnbd099scnu8qr1b13gp/vubesasab.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/66293728878.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9j0t0u3m9sb88cmnnc4lmmsisj/96838910353.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/sisijadisiwavap.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/46916794204.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/18527398617.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-12/2b6ba8abcd7d59bf24bfa199867b9635.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50138104953.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///jubabixonewukuzupitadedo.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/92424708731.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc306d83a---vefedemamopug.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161410e2c857c3---dodiv.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/poxer.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/gosakera.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/kepumifigodonibuwibofiwiw.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/zurasupuxupotubezopufi.pdfIn PDF document text
    • http://grupophi.es/uploads/files/31055671476.pdfIn PDF document text
    • http://i-physiology.ru/upload/mexitudiladigazawov.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_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 17440 bytes
SHA-256: 03b91aa0e7af011d697360967c613cce94b5a45e9eb9193f20c71791ffff985e
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10728 bytes
SHA-256: 99a9f1bcf84cf62086fb9c2cc8710e62220a3227dcc21cb5f69bae42869f9601
font_02_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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