Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b20cfd1c4e48a6c…

MALICIOUS

PDF

97.3 KB Created: 2021-08-30 22:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbc7e920e9c5c2c639b27a0a9e987bfd SHA-1: ffce21ab7ec0fe4989b0b4f6632b67b4514be362 SHA-256: 8b20cfd1c4e48a6c67671cbea747287c34d229ba5b9ea7e34d603b37ab83e252
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The embedded content is heavily obfuscated, but the heuristic firings strongly suggest the intent is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16111f1a5e53fd---69469839650.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/60024786556.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/93425364797.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/zijezigawewuxudu.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/2824106957.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/fogamuvupavo.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/802284611.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/rogeteximizitakenomugizew.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2912cb89f6---12085188524.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pappjdpitfl3ltufvhvl2id1ln/15170942139.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48ae033599---90837574601.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/59004424352.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/48413866321.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210717_212700.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/60281293608.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/muwawigebomuwur.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bsmptmdfkvip063dotalf1ou0l/durubepelenasogujilije.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bb68cf47b---60472655303.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d63f8841a---kimexazoxoz.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe6b913c6---3941721014.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/45tohpv4vgbp3c16n4m1915rf1/pejekivabaginaxesud.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/tavorisalu.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/vaponiz.pdfIn PDF document text
    • http://northcity.rs/slike/files/wotoxomi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d0dea3ac---xewefidawujeramowodo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/thlnp0lt2me8phc5h7csab55cm/jigezav.pdfIn PDF document text
    • https://sanagustin.cl/files/30271517493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=formula+for+spearman+correlation+coefficientPDF 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_off00010b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 10716 bytes
SHA-256: 31ce52ad25e40d85fba78c6ba28a45fec8fc739a9a28ce7c9b08123613b8ba46
font_02_sfnt_off00013c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3B 22856 bytes
SHA-256: b26ab2662ab08b9ca1e2db881a4ea8258bc705e537e902e472be5dbe2bd3a84f

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