Malicious PDF — malware analysis report

Static analysis result for SHA-256 606b7b5e1c70c507…

MALICIOUS

PDF

92.7 KB Created: 2021-07-08 03:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de53bc2eeb4793a11d7a9c3256a7895a SHA-1: 9ac2d532647b9337143be404470e2d4ce8760d77 SHA-256: 606b7b5e1c70c5079eae6f3adfdf17b8c45b7126b541b8ec047fbf606e33616b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other disposable domains. The primary goal appears to be to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://oniceh.ru/uplcv?utm_term=moving+out+of+rented+property+checklist PDF link annotation
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/34cda400e324be4889fc9bd0aabc021e/goketivirorevi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3d7db45439f31b163f9cdf318eb3bcd9/99554060157.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607597e6cb967---99073329516.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ql7renffv6v7mpcqgoi8oi53dp/tokedunopukesavigagane.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acaad73b3de---puvixubig.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2f9661eeff4cf337b347593969b2b2ec/12559841520.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d05f16aa68---4700367295.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/zuzofunigawibamek.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5babc7556b---92410604327.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jazomekakawu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/44c6dc4a011731d9a8045b93323eced4/42447271763.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/19081756768.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/niribajunonojuzokuvutofiz.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/dcdcb5e7359644e1a843ad81059d8a5e/ludazuba.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc6134b33d---wajopuzupuxodod.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/186f1a3edb591ee511ee8a933e8dbafd/23563720665.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/tegekazoxitu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9abc62d9c---98428796845.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/fumod.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/mugikifizobarivotepet.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/tomapokefujufidijal.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6f5dd9c70cdf03032e34c57537b40d6f/gozabejikivelelewutono.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/23851523406.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778dc17e429---93643306573.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_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 16996 bytes
SHA-256: 0fe0fea7d89bb9dc8dcc0388012b1034beb85d8c2fbec53c6d04018c3e38dd03
font_02_sfnt_off00014bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDC 11100 bytes
SHA-256: ebfee0373ae361b2595beeb29e3b02a0bb7f858e3dda483b25f1bb482bd9a6f1

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