Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18e5683c9370e2e…

MALICIOUS

PDF

74.3 KB Created: 2021-08-02 17:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3709cdd33a0d7b16c2e561b4a6620830 SHA-1: 8d9d708bd91075b94a0459d45e501d137580879f SHA-256: f18e5683c9370e2ed5cbfd27cbf5b05d00e9cff5140231ed003291d3f93ae7e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDF files. This suggests an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e28aade3ad---94755285969.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3478d027497a37f150e47cef3f6fefdd/xovigunifakozop.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/rudemopavisorebiburazo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/upoel1qe9b0qqltgurlvh38j5j/nolaguniritolunaw.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/507815f2510da403251316b20fb8cfa6/21824223496.pdfIn PDF document text
    • http://amdind.com/userfiles/file/46442517950.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/41bd18de65876d1b7851e34526a47248/49758860585.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ukbvnfgc5o9jh0jprj51tvc66h/kavosa.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8920bc548d070b21decd859335da9713/1872412022.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3bf59e28e80fbc8dec1d664ca62d0ee8/mozifo.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/c4jnpcth5i8d2lc0g3hjhidhr2/xudowutuju.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a052902b273---85215362316.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/33372321369.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/topefuvaki.pdfIn PDF document text
    • http://rayer.cn/d/files/81669245772.pdfIn PDF document text
    • https://hoongnau.com/upload/files/nivadesoniwawarugi.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/s2i2ds5lsp1lnmgid2dd7djipc/lanikozagorisimabebuz.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/lorakajuwuros.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/8296123521.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ccbfa9f02e6---jonatojewi.pdfIn PDF document text
    • http://flexa.cz/docs/file/53267182491.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6315413f327e179ed5233ea810a00afc/76204773212.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/lafifujevurolifekowelal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=easy+balancing+chemical+equations+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_off0000c183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 15188 bytes
SHA-256: c04e753cbd9b604ae7e3276250bb9554cd672114e31660ae394abd05be55b4cd
font_02_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 11340 bytes
SHA-256: 032e35602c231ce8b2f3e770cf9d01ac3308201221fd529053e02faa94034705

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