Malicious PDF — malware analysis report

Static analysis result for SHA-256 785afea28fe68616…

MALICIOUS

PDF

85.6 KB Created: 2021-09-08 00:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6d45510d2d92a6f47a3d40fb9de9b4d SHA-1: 0f9114fd9ede42907892b6db636e7f596e03fa9b SHA-256: 785afea28fe686160e1aea967c609c877691dfa52d87cd7344838dcac2c81d38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/47be6145a70c9459de4f3573203ee704/13742198093.pdf In PDF document text
    • http://nedirajtebosnu.net/userfiles/file/suzokotabubusewokadux.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/85263928605.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf257a7f7dc---lumefumafelemupuj.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c57677457b980a670835e4c6ca76b906/basamexurevikuremula.pdfIn PDF document text
    • http://josquin-capella.de/download/96659297700.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/49271080944.pdfIn PDF document text
    • http://carszana.com/image/upload/File/xepelel.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0b98b7448---24509673030.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/87133345667.pdfIn PDF document text
    • http://belv.ru/userfiles/file/69427033553.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/lusoriwi.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/dasadove.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8a52eaa5---60689923353.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/37691737478.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ab2c5c8fb---9384830454.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/gonejonirozuko.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/83941465651.pdfIn PDF document text
    • https://people11people.com/uploads/File/34632644830.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/77769740145.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f8ebc1ef---duvepitenabitozi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/74dacc78512c906aa31c6baca876de1f/40603873088.pdfIn PDF document text
    • http://goldenapp.net/file/26152364027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+pdf+writer+for+windows+7+32+bitPDF 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_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 11060 bytes
SHA-256: 1905817cd1e183624f32469a6b84fb5915596cf5fe103afc8d42cb640b34d1e8
font_01_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 18140 bytes
SHA-256: 7bf431b9b9dd3e880c55b0d6c34b548a56b33c705ea3b1c001dac0b489a52b4f
font_02_sfnt_off00013071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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