Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d59cc52b9eb8f0b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 22:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec94f6ee798be9f14854dd83f58cb0c6 SHA-1: f517dd1cd12de572f854408d04b480bf8bf0307b SHA-256: 9d59cc52b9eb8f0bd4e02ea6fd98e9f92bcd6dfeb022f418450ccad6f42187bf
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files, many hosted on compromised CMS upload directories. This behavior is indicative of a link farm designed to obscure the true destination or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://keacg.com/upload/files/funojugax.pdf In PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/xegokakimajatosewo.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/fosesutovoverasule.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1kkodinoshpj58ojt4nk7s77p6/57636408658.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5a3cfafb9256335aeb14540fb12ebb36/wonobenebul.pdfIn PDF document text
    • http://philboyd.com/lisubasezenejinodigurizi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/96335968814.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611351e8a6fc5---luwokusotiroxin.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ac9ae9ac---fikanitukijaxo.pdfIn PDF document text
    • http://4yoga.by/pics/files/biguluji.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/valezuniposoxovukimaj.pdfIn PDF document text
    • http://kahasat.cz/data/file/21078043174.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/f7r3ilem63ch81d0a2n5as9ojj/datof.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/dijitexa.pdfIn PDF document text
    • http://ipllaser.in/uploads/xipesarevixevagevunajev.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd49cabdf4c---bemodorevag.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1646b503d77f2b2dfc714eea2a559ffc/72820498493.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ac919bbaddbad5cb55e6279181cc5730/85900657207.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f013214e9d---84412699139.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/50905504.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f6643929d---70003614344.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/67020427807.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/vupokoz.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/08a2684cef3627b65434438a847efc41/4503988464.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/gevidisowuxemizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=anticipatory+anxiety+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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 16948 bytes
SHA-256: 75c4dcf39b4d75d16f1a1e8446395c76f4318f3f252e2aad8da3c19d8fb4dc77
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 10596 bytes
SHA-256: 490942e5159d0728d091447ebad6a2792053f37d404a586ba3ac0fff75a6884c

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