Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a9b662d4a2d19b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 03:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c38afb747901ed212bafa79fa5c400c SHA-1: edfb497b4ef55d6106f5de7c95d80704d692a4e3 SHA-256: a2a9b662d4a2d19b9024a9e04c2b96b1d6cb8b5211b7c56f4ee623e3eacecb64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host additional PDF files, suggesting a multi-stage attack designed to distribute further malicious content or lead users to phishing pages. No scripts were extracted, but the structure strongly implies a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611822e2572b0---zumejaxomereze.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p2271neo94inbgl8ujmsemn2d4/zikadiratemux.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607988a2653bc---dobitot.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/supifilipoto.pdfIn PDF document text
    • https://fallsplat.se/file/4359639750.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/94110307350.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608584d5cf4e5---59304566651.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/73845445495.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/61053120633.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/nakepolusapubar.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/tujuzapetima.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2bd3d27ec---bulaxiganovari.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/57387519953.pdfIn PDF document text
    • https://o-dance.com/upload/files/vepulo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608f445909894---lubozotu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/widen.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8f4c74ae20b668eef215880c1ea54bf7/2552780423.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/92840341635.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976918787ff---79639319488.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/79743901249.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/mcncang9vto9igik12j83h7nl3/91562961328.pdfIn PDF document text
    • http://cpils.com/userfiles/file/92956135325.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/pawezunifupokezizuregixud.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713d8852c6---fufowoxolis.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/lamixomoboweloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=oral+hypoglycemic+drugs+classification+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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 17848 bytes
SHA-256: 35bb7d63b7f8fed70456101a25a0f11c5a864e2a38898406121effc7b69a5171
font_02_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 11304 bytes
SHA-256: dbebfddab7f99d84acc22d00f458c2ca3eb40f959930a230035fc0f35cd2ac2f

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