Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bc4a041dc15032…

MALICIOUS

PDF

71.0 KB Created: 2021-06-11 13:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1966f85faaf3aea0cc10e988fef7fac SHA-1: 403bfdfbbec066d0eb28026a92081b9f14f907ea SHA-256: 74bc4a041dc15032ead3ef91c0bb2a50550d0c7f25db23ebd8ffe816fd676089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malware or redirect users to phishing sites.

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://allytemp.ru/uplcv?utm_term=bohemian+rhapsody+chords+randy+coleman
    • https://airflow-skateboards.com/upload/file/lazizitubobosemusedomof.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa7f0884d---67103093615.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/18457331395.pdf
    • http://lookkorea.net/userfiles/file/19013806609.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/6jih1eejjhv1b9bkoair70ujm1/38402128961.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e61df357beff90972ec1523476ca8513/bodunoj.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca202d7589---284901882.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1be40c5f8191bd9ee788b5b81896ebb6/95175158276.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081aba27d722---40138451594.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907ce19e50f---4752322327.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u44lpcjoadi2b37ocdubkf44s1/95359504849.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/8203581077.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5cd5de6dbef0a7f7caba48fa0de32137/vuwubojunimi.pdf
    • http://www.klimavill.com//data/editorfile/nomubojenu.pdf
    • http://kbchina.de/upload/vejigewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b8.bin
cff0d71fbff550879405f8163b8d20c970cd83bab771a18414ac0432e0ca0b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 5464 bytes
font_01_sfnt_off0000e826.bin
1d33d138900b40a956b9dd3f171cae4bb809882402d0c7d04655f7990f233274		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 11900 bytes

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