Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b6a051304e98bb…

MALICIOUS

PDF

78.5 KB Created: 2021-07-31 16:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11d2818a2e4e4434a0c4c1c9a804bf60 SHA-1: 5d39c601d5b12292e3dc6e25fb73a71efb9b9180 SHA-256: 94b6a051304e98bb35f693cbd27c734d5e8ab93365cc454609429a525cf35fd5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://cructi.ru/uplcv?utm_term=solucionario+libro+biologia+y+geologia+4+eso+oxford PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/357d7407ffe7bd1d32efa32e68182228/62521156665.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417502ef71---jibuje.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/gokisetadin.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/83116202012.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314d36557b---tabelafexadu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90f169adf3---gizugexebajerabezep.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/sujilodo.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f789d7c3d---fonepegexawoxizexebadiku.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mc7j2t97b8u8pssf3e3netjqe0/43550755644.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/kujukavidetake.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/37572315738.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/56099187130.pdfIn PDF document text
    • https://andana.us/files/files/48039915670.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/48963072b0740c1a9ae50c5bf46ffcb1/37429122089.pdfIn PDF document text
    • http://novichiha.ru/pic/file/31893333217.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/99296221625.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e616b7f0f60af3534d88c6b189a18fee/336772962.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/kepetujozoruzotupaf.pdfIn PDF document text
    • http://gptools.net/userfiles/file/83041279680.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/85254485257.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/62144906235.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/31069853404.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2a5343fcd---47853643033.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/79451771333.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2bbde335e8160503cdc6b7aa3195301d/konejowezil.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/92347fjbpl8b977om76tufp3t6/38933754399.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62d8c2374---33546783373.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_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 17392 bytes
SHA-256: fc20ee96b3172d796826aea3ab1072d739943df657a6f93ee7b4350ddd0f3804
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 11164 bytes
SHA-256: bc43339fae1b7e5eab931121d96eecc68af87925a68cf1dfc8cca43ed3eac62f
font_02_sfnt_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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