Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a760588eef0e55d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 16:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 22041c6cd53ad980c0c962f9eb8bbf14 SHA-1: f99f64ef97ecc7559b5fdb4e77f12fb85d0307cc SHA-256: 6a760588eef0e55d7bf948614bfd6cca2a965bdf99782fa4b961f3a523b5bda7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or malware distribution campaign. The presence of multiple distinct hosts hosting PDF files suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0fded530a15516e538065e429447e3f6/kidiz.pdf In PDF document text
    • http://artdental.hu/editor_up/3990176347.pdfIn PDF document text
    • http://keramann.ru/uploads/files/vanolusemubizoje.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c483dbfe05---depipax.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aq3t5qjg2fmk5hhbpt9p5tmf45/81007738454.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/a8ljn1gtvt49mmchm5eqjrrj19/mirirev.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/fisewuro.pdfIn PDF document text
    • https://digireg.se/upload/ladupowajifazufakifawexi.pdfIn PDF document text
    • https://emmaushuis.org/pages/xivunumedewiz.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/63671238332.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a943e5307---80813366942.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/botefazosupuwir.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/65147276300.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/16547899985.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8j0cefasnqg19tq24aqo9e34i7/nitetixidawejezus.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/mikidojuzosowoniseketoza.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e2b8bde89c1ee599f01bc1bf987f74a6/23821175369.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/fb25edc245b236c60f3ab9380d2a7eaf/luzalubatokovogigoxobaz.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/rufijigufedofelizod.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90b64f2fed---81577355468.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/61531280962.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/35558203605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=repeating+decimals+worksheetPDF 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_off0000c132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC132 18268 bytes
SHA-256: 2810d19d0bc5a1ffc8f2a4f3c290df6c8478e7e5cf043dcde43bdbe3dcd2c805
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 11184 bytes
SHA-256: 0d90247985fe9eda96cff283d4dabc83550bdcd223d4a56bc5373e03b3513619
font_02_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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