Malicious PDF — malware analysis report

Static analysis result for SHA-256 85acb8aa69c65e40…

MALICIOUS

PDF

90.8 KB Created: 2021-09-07 08:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e1ee4b1fe2f2ab7e76ebdf080a413b49 SHA-1: caebbf933348d9edef09011c1169e29515ebe826 SHA-256: 85acb8aa69c65e406d61e1af8ba833d767a6d84e4ace130fc3bd78dd4454538d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b45584585---95794083517.pdf In PDF document text
    • http://pytextiles.com/userfiles/file/nolaxugomoxuzojonugodekuz.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a0aa226db---nukad.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/zetaxinuruwokusaw.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/91633385961.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5a8afdaf35e22d8af38ba75f04307b0f/67770255383.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608df0459736d---11863079403.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8a558dbd1cb67530d63de11394cab30e/zonatebozemukusonuzarik.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/soditirawuteretajabeso.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/449d36d6374f0dd6f49a0f61e7bf0810/21207251432.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ovpoelpnoosk2hnfnmoc69tmb/tomejalisuw.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28cbe5bbba---73490155066.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/safijapakob.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/21b9f2c087ed3b9a02653f32557c6bea/kukafititazuloxemifelum.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ae2ef28f---1517927276.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/ronoxuzoxokokuv.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a1d2a556be2febb16c42f346d2e8aa78/xutixofojerapotebitab.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/ralovuwigezatusaze.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7aa1bee7---77242865477.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/92cc7g60sjf2nqsq4onrqk7sni/41393629314.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/22144897978.pdfIn PDF document text
    • https://mkart.it/uploads/file/63961535101.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/80591993476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sportrack+skyline+xl+cargo+box+manualPDF 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_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 11340 bytes
SHA-256: d4751f942722f5219af1970a5b2a04ba6821a15b8d30593ca003d191988de989
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 20872 bytes
SHA-256: a64f6f1a6fc1f91bac26cae331cad275a064bf1b7341197c99f845689c613128

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