Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc486cce9166344…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 11:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c2afa8418ceaa8f74a6fb018c518d5d SHA-1: 341ffc214541134cceed116d7746d20b8edd37f1 SHA-256: 8dc486cce91663444f3864459cb54b3771186ee98e361e43cb6d3431d3e80f66
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this. The primary goal appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9f7ce62e466ed23a761ac7a877e74561/18330505877.pdf In PDF document text
    • http://iktoktatas.hu/files/file/72355029577.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/merora.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/760ovsv55vu3o128cg4vnsiev3/89532571467.pdfIn PDF document text
    • https://rajakedua.com/contents//files/vuminiwakatipofif.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/kulavetixasinepom.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/u0e31d45haai1vimp0g7vdfnps/lafobuwuzevesogupeval.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/53116813174.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620fa3de5b---40517967714.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e643f6timqugal19u95qpcnmp5/fobelepitafezovuvabipa.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5dea388e---butadojazow.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/550762796.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ca1147a0a1facbf4d8eb56c215bc8102/58440015261.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/kopesapiwumoj.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/fd9d5c94e80ebc06181b4a5c2d12cf7a/wifesojekefabena.pdfIn PDF document text
    • https://music-group-store.com/upload/files/wonuzuselu.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/37547200455.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/5946c53f67b8d683b6b9fc7001a719bf.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d118d127f5---6541126408.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/92686965514.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kanozufukopi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee2456868---misoporosuxekisoti.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1022f47ba8---95584388179.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fc9365c4881ea63ad4191af610547f26/88636377776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=digitally+sign+pdf+in+adobe+reader+dcPDF 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_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 11048 bytes
SHA-256: d804a45161e2c11fd6c032cc81be6a10e5832b1a655c3ae6753b1a78b44f4f9c
font_02_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 17776 bytes
SHA-256: ff009776202a71faa2023572cb098521800562b3b7a8d8048672a3bf0ea6c417

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