Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2dbf28467eb49a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-01 19:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8345ca8d98cdbc7079a1fc8bcc8d9f2b SHA-1: 518ae30151abe7a2ca37e08008d904194abe479d SHA-256: 5e2dbf28467eb49ab2b0e01915d6acdb6cc53009a339d3f15bf100ca04d52eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of numerous distinct hosts and URLs indicates a broad campaign to host malicious content on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/663baa5adce8693661f9d0f7ffdcef75/37431486200.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/72a35385a6679b16475db639f6652111/5802700951.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/64e982ff06f04016804d99e2c1fc724a/11399139506.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/napiforobesaba.pdfIn PDF document text
    • http://evola.it/userfiles/files/wunirodufawof.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6qdbvncgu3lq124465hju6a823/tolaxuler.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/32169001158.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/pugasoxus.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16086560684eb5---jusixited.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bisumo.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/4a01ee6440a32a5e9e8db0e483790b2d/57302323444.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zutugotudekowobajupasurom.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ab684087bc1---54055026201.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kedakodexor.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/70615835970.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/zexomi.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/14204015461.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4jsm9bbnb7s5jm4f3972ugfnq4/63739124799.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/tugube.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/61484516554.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/36a4a3966cafc28cd00340e74ead1993/64294507331.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093caa94bf8b---mawejivunajafetiwudapopim.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/96723599786.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rgrfuq8d6if7gl7ci74qmehhmq/59827983032.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/5092913262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lonely+screen+freePDF 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_off0000bc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC38 14988 bytes
SHA-256: b4b51fe1481ff6595de9f603fd8d81ee6cb2b520b4025f70cb0d4d272eb55f79
font_01_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 10048 bytes
SHA-256: 9fde9ff3a4d3ccc39761e626e3c32966131fdda0fbe49030d473d331327f9377

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