Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d219dbd60aedff0…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 04:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5b0e6f77893e2dbc1ffeb4e7a53ff7f SHA-1: 39e50a56a2efc4dca5cc5cedf2cb22153856105a SHA-256: 6d219dbd60aedff0570fbab656098c879aa759208620e69620950b76dd8a3f07
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve further malicious content. No scripts were extracted, but the structure and URL analysis point to a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://rafaela-motores.com/userfiles/file/kebum.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/a7a7rr758vnivfc2g7i65u03qq/83337221914.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/tibelidewekatufu.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/89970854840.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/543b76644ee4933832ebde78fc593334/24483392364.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210815005657.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/67086c204ce5535127068a986acd4057/66916250816.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/r3m3522jauuq97hh6gqt7ghp7l/viwupaxeresifa.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/pebinuwoninawer.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/pixofa.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wunukitu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf27898890---xalosagawikexavunukala.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/89309619882.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e5c33fffa---92682655861.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/49210326335.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/29293756817.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/99862263203.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/22789002491.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/bogobuwuzatedanoduva.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/97393130351.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/rivazodos.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4dc9b216aba3360cf8acef3ac1898136/23675298031.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/duvuwos.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/raviduzisakutejasi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94b7239d61---39034298753.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cae3cb0fc---vavepikut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=imacros+for+firefox+tutorial+pdfPDF link annotation
    • 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_off0000bb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB72 16364 bytes
SHA-256: 2aa89156680058be35ef96481cf60bb3295574d352f9220e61a55a59292a3778
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 10832 bytes
SHA-256: 2cd3ec32250fac8c6de6fa0c179f5f0efe96d7fb3e7062c40b69e225d532f9ba
font_02_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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