Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3499ed249d0879…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 19:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8589cb8e30bd50c4598f9d5a1f7cabe SHA-1: 1ffa1c1e07aa7a06f090558defeaba7cc4d1181c SHA-256: 4d3499ed249d0879db45ecf1bd942d74867d84857fd75c04629aab0f445d231a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many of which appear to be compromised CMS uploads or part of a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious external sites.

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://garglob.ru/uplcv?utm_term=prepositions+of+movement+exercises+with+answers+pdf PDF link annotation
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/32267404475.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/1vcevmc5o86mtjha2o73oldg3r/xojexofig.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/8967316281.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d79f475bbca---bumusudeguzupezal.pdfIn PDF document text
    • http://www.bandungmesin.com/file/vidunawuwezuj.pdfIn PDF document text
    • http://ligneus.hu/upload/file/wevumisubu.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/56779487876.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/fonorameze.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/325041710.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0eb36a00d---pajagogatimo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/44f021b2e5ebfcc516d32a511823dd6e/pesodajezejirax.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d81570c45---wazawemotun.pdfIn PDF document text
    • http://dzbnf.com/upload/file///46460792807.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/23253459062.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5272ae324911009c1ee4a7ce15dbfdea/wozorozufa.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/fawujo.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/89046994958.pdfIn PDF document text
    • https://aedwea.com/upload/foto/93912156230.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tanaze.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa1f76c0a---18981720594.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/88169198452.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160929e00e801b---24644942674.pdfIn PDF document text
    • http://vinmexindia.com/uploads/45394420535.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/34566552538.pdfIn PDF document text
    • 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_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 11096 bytes
SHA-256: f89dcb9ab02ec54ddb627351479367b96a49c6c4fce84caff21a6a34a9f53c10
font_02_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 19764 bytes
SHA-256: 02003488e17879d5a41fe1f21ba8e6bcd9b6481ff852f1aa9410d47bcf8d7dda

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