Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c71762d1de9536…

MALICIOUS

PDF

100.0 KB Created: 2021-08-09 01:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1bef4e07d42574e1dfd1b30948990f39 SHA-1: 656ecf7d06025e2019ae5ce7b2ba2d888f888ae5 SHA-256: 26c71762d1de953657b3cf8163450bf29c741e021e3197e8b13f8867797b2ab4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns align with common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://krisoc.ru/uplcv?utm_term=periodic+table+of+elements+list+pdf+download PDF link annotation
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/sobatazuvidivogafoduxoxof.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/mivojetadikuko.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/56859797658.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/47200717340.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/92992080024.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210807141108.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/8tjqchdmsl9jdomoc2qpkusocj/joxomapabizezimul.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/55407287800.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89e6804f0---sodemulizevukudiw.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fq5re22k088ol4cd91b5ujn0i3/xegudadukotawixetem.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/lenizobogezejaweribimajiz.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ad7b0f92c944d3316d5d15343931b3cd/36556112024.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83c31316e---xumubezigazap.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/nukudulezekidurogo.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/64893672087.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718677bb1da---50052441122.pdfIn PDF document text
    • http://agrion.org/upload/fichier/vapawidudupe.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/4ddf719eb67c9d5c8960fef6fb3eeb82/84047620688.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/20333437622.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f33ec69e0---86471494967.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/59827529096.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/60416406722.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 11008 bytes
SHA-256: 9016ff25d17eb7988c13baf1f100409082930f05b280b70a88c33fdb009831aa
font_02_sfnt_off00013e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E89 16228 bytes
SHA-256: f2666e95f4599b990980a0abf2f374fe3006e34437484733904d739abeeb93bf
font_03_sfnt_off00015469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15469 17696 bytes
SHA-256: 7b5f8e1394ff1d781d55e62ace7ed808d031277cab96e4aa982f6c7c89553237

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