Malicious PDF — malware analysis report

Static analysis result for SHA-256 1244540b94db2b8e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 18:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1c33c96715de1dd758ab18dec30304c SHA-1: 6cd7b0f9a5942c34ac49d1a4b48b5176b5f199e8 SHA-256: 1244540b94db2b8e21d8aa5cd2fb070630c5a552b1ef13eb208394345f84fd65
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely serving as a lure for phishing or to distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are part of a scheme to leverage disposable hosting for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=skin+toner+formulation+pdf PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/715467ca339d8ef807bb59e1d337456f/kedajanenakurulis.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/38059220529.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/51830993749.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8ef8b5c3---vojubota.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbb827fbde---vazurosimaro.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b1d3bfb3---kajabemeduzinizova.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/99550538126.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082235edf511---60887097076.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-10/20210810010517236608.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/ruvuxi.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/mifedexaxanikuna.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/0e9b5npm0g97vl5j550g1vsd5a/24398320850.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161095ec95aa1d---75151421566.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/78939167910.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130040931fac---tufupazefiremefewinog.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/24276479373.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/d4q59ggvv6tjdrqsrj1npded0a/sosesut.pdfIn PDF document text
    • http://nature-revive.org/files/file/minika.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/fojalokevumisikif.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b0soglfrh6kkuvsg8ahb1j9g53/68721444742.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jebujanipijifisonosefu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/h91122hjikmcc9s1hkpebeept4/goxugitaxefuzudovoliwada.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/fatixisa.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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 18868 bytes
SHA-256: 9edcc9f0a7947d2fe8981bd2da2d6bc0171a2b7ee9a4ea3919a36c3059695008
font_01_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EF 10756 bytes
SHA-256: a80ed662acbe6b0aca8e1d1ce60e6bffb48373fd98959ff6f31d5f9af37f60dd

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