Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a00b0dd84f2cfea…

MALICIOUS

PDF

150.6 KB Created: 2021-07-03 07:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 973aea5224feec6b816e6dc410db9d71 SHA-1: 037c1ca5005d682b2bf47eac31ccdca0242d5928 SHA-256: 4a00b0dd84f2cfea67b930b52a8a59effd8fc2151006667be44d6eeebb38d3db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://drafthe.ru/uplcv?utm_term=microtubules+in+cell+cycle PDF link annotation
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e685fd18---97822819363.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/bisotefefuxoto.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/wosadekarenaxo.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/43019667276.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/76d41e467e3fe74bf742bf7f5b0c3760/pijifasinaxevegen.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/sftqq75dfs443kqbq88hn6beul/96198850247.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/2524565716.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b1cd6232---35205059812.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c2ba9702e741d90c9ad75154fbce5f46/duxupaxenok.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0381782001619806759.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/d8bbae45b9666e3450a45ff702e5ab15/87173477677.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d76c0057662c85b8870aaff5af70248a/59928014259.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0555d6bc8e---95034544934.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d507de63f---sotemaga.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/32907db45b8023a3658f1f60c2cb9c08/rupufavirizudeniponazozo.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/44960541911.pdfIn PDF document text
    • http://abpaluso.com/upload/file/nelixamegifubitavasomuk.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/478dqq4ugbi5d6kq214441vag2/kaxebumolu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ad97506746303b8c3fba433677a5506f/19029647604.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/382f7a6d7bf5ec3b5f7eb5831c18b092/13570160747.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082379f225f2---subevidaruxekijaxobuko.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7llpd5kudepf1qpj6t0jgsqn3a/3487259209.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7hp7emrp7qommljest2re0eocr/70619755932.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_off0001e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20116 19684 bytes
SHA-256: 3bcddbddecbd8984a7a71f4666816bc8bbbd25f57631fc35e3cb5fb85b471074
font_02_sfnt_off0002353c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2353C 10408 bytes
SHA-256: de93e8c6ed0812e28eb27aae4ad14033f0cd807cbe5e2cd3982242641e3f0312

Open this report in the interactive analyzer, or submit your own file for analysis.