Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f76d1ab36a6206…

MALICIOUS

PDF

92.7 KB Created: 2021-06-22 18:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 02dbbced70fd982ed6e3772a05cec9e2 SHA-1: a8a2cf3ef22002bec63414505512c3ffc0146723 SHA-256: 37f76d1ab36a6206e5a78f67e64d87ab689021c01b3e5901235c69b761696e5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Numerous external URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=vanilla+wow+paladin PDF link annotation
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/18cbe553e74cf8db27df0e3e766253ec/jixugiziximurepojaxebe.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/manarata.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af699ccbdeb---gitufodugixefaxexilireg.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/d7rie5qisc100kepo65fh1rrpm/gunezozan.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f9844ea9---40425245402.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/xajawemuwi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3f348782c96e7234759c1b1730473653/9142875794.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099bbcdc25fd---96792069220.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/269d4a37bef7dbff18b592064361a1dd/judipozomijifatog.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c33ad10669950df64209ef0eb7e42564/52197645690.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/30ec19f123dd6480454be4fadc8ec967/79193455587.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/e7384e21fa19f5f2f8d8067283b2fa34/wexine.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/felapakexafasosixusilidi.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/werusejukiwozuxivi.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/85490501396.pdfIn PDF document text
    • http://davcpundri.com/css/file/sijidezefabavoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 4736 bytes
SHA-256: c65e65ce661c068f4194a68323fedded73419b97508a2398381d80532840ed1e
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 11392 bytes
SHA-256: a6f170566c5380d48eeaf568aea60fea92914902cd9fb8da6db763deb32cef5f
font_02_sfnt_off00014f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8B 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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