Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3030db400b1aed8…

MALICIOUS

PDF

85.4 KB Created: 2021-08-22 05:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0a779ce00bbf41b68d9dab59d6976c4 SHA-1: dea0491f543418b4627948225b07fddc4bac9f1a SHA-256: e3030db400b1aed86ccd0268d553f14837a575c13e4c692fd801257b9fbd2f90
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a phishing or SEO manipulation scheme, likely intended to lead users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://pixomot.ru/uplcv?utm_term=how+to+learn+card+reading PDF link annotation
    • https://contabil-fiscal.ro/mm/file/mepedojilomenovagow.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f21155ce---21609989487.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/powuleziwegoraje.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/92437578880.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/4708091546.pdfIn PDF document text
    • http://i-dron.cz/data/file/dagivurafavul.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fuvezalopodanubixak.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c688c5b62b7---44429931077.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/piwexepuvuvu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/revinotezepakemibuvug.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfcedb620---jalokixagenibuvisatim.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecba2c0afe---35245694230.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/69359611802.pdfIn PDF document text
    • http://chinalabware.net/d/files/sifemisamodemi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58270488b8---89478746243.pdfIn PDF document text
    • https://777mto.com/contents//files/jofow.pdfIn PDF document text
    • http://nemochem.cn/upload/files/pasuz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/33fb279c0f7d0e42339717f3d94a3727/kexevodojiz.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/58770272921.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/45cf667ba3df97881c300ad5176683c6/56953462569.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160920f2e0d812---fuwebojebosupivi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d1a75a5a---losapidadudaju.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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 16824 bytes
SHA-256: 5c47c793872ad279f225fe5eb0f98b4ee35da54b88181f49f9147d10f7875145
font_01_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 10452 bytes
SHA-256: 00d061deaf68e93f6c8c9f68b7da1564f0fe007340702a08370005aa1869b171
font_02_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1