Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cb079918616165…

MALICIOUS

PDF

78.7 KB Created: 2021-06-25 15:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f80b66a122468afa979cc50fae0bb394 SHA-1: fecf126c9b6b4566853462f9cee44f4f70824b18 SHA-256: f2cb07991861616593b4c142433eda3dd40266aee8be6f60dd9b97af1daf4e3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=biomolecules+class+12+jee+notes PDF link annotation
    • http://md-servicios.com/userfiles/file/12614458049.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8i07i25bos9ccnlvja8olkbik6/19967195205.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/fiwufeseravajijovaposas.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfufehnls4cuq65v9v27mbnj4o/90231771877.pdfIn PDF document text
    • http://esistore.be/userfiles/file/75367758348.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/05319b4efe92f9396e57625563bd25e3/fimitaselurotudeto.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ispp4lq9k12obkbbniluh8kabf/dotimiponupij.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zovolabuwewamujatated.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210529163538.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2241cf70e---butuxer.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qgta9t4dbn1pbabn4gme2a8tod/jokijeralo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lijug.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/58626450811.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fc63e771aa505bf8f0e8de46072295a6/zugeguralevusisapawuvu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/54245853578.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_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 16868 bytes
SHA-256: 21781f8bbe0bb663cf90e2be47b149c26f2d205889b1edd16fc99fdf77d4fdae
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 10744 bytes
SHA-256: e527e2d7880d09ead44cd9d4f3eff4522719154cb0f75db40c757d1d7c67a82a

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