Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7fbb5e69998af6…

MALICIOUS

PDF

88.8 KB Created: 2021-09-07 10:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ddff37e03b4d9eb22a5641d5215160fa SHA-1: befc066d7ff57fb77d58260a46889a177973ce33 SHA-256: 1d7fbb5e69998af62538c853fefc8c3490f25fc566fd9d2d28e2abd03bc29c18
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://visit-pune.com/userfiles/file/85071762654.pdf In PDF document text
    • http://amuseonline.com/absite/userfiles/file/86476116128.pdfIn PDF document text
    • https://akemi.ro/hirek/file/44280248317.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/repivetosananatexuretu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a83638f7b---24471612755.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b453009fd9f---27920013136.pdfIn PDF document text
    • http://fitviewer.biz/files/file/lufumuvilenijewimaven.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/1521063804.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/86da7e54b6a53142479fd90ca81e0e69/jasilagalejuvirusunifux.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaabd65244---punejepibajajiwusukaw.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c27b80b6d2---mokabawedabovesosuzi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160945b1cb9eef---tibuberon.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/34a155a09edf66d3d5850c4cf0c77e94/vepijezeku.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ab20vi89737gpdm524jfoikdme/kenuzunegarufesogo.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/dipowi.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/funepebog.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/08-20-18-25-59-53.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/3uf6fur0kpbq82kn3hl8sdpacu/sekigigovawewewifojiv.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/73838805644.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/5061917954.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/zupiwabewibisa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hmet5fjg19o0kp9fv6im1q6boj/11794107148.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098520f2070e---puluzobonevup.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021611058576908.pdfIn PDF document text
    • http://www.polni.si/Images/files/xonezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vocal+warm+up+pdfPDF 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_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 17900 bytes
SHA-256: 639b3da093bd955983adbe13503c245e89e71c065161eb98f3805e0a7929d896
font_02_sfnt_off00013e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E14 10344 bytes
SHA-256: 0f6fde05379605efdff856237bf9a8b95d26f64a5b3923ebf500d0672fb4b4e7

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