Malicious PDF — malware analysis report

Static analysis result for SHA-256 be583a312f474275…

MALICIOUS

PDF

94.0 KB Created: 2021-08-07 18:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a6822ff5e178c9f6e976582d7b6861f SHA-1: 17966f2b4a947527f4908664af05b0c5267649e4 SHA-256: be583a312f47427514a45d200911e0232fab182810af1eedf4bfe1261ca7190d
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to redirect users to potentially harmful content or exploit vulnerabilities. While no scripts were extracted, the heuristic firings and the nature of the URLs point towards a malicious document designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://prospekt-rostov.ru/ckfinder/userfiles/files/4621967792.pdf In PDF document text
    • https://mauspro.net/upload/files/12582111610.pdfIn PDF document text
    • https://bloomeng.com/uploads/rudome.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/82714220813.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/16365608028.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/07/file/20210607_161248_167.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cc0653ae---madaxitavalegipeg.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/40b22708ca99fa39fe3318d7fc2f63ec/26150413569.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/pikosutureresuxafikemal.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28fef06b9---53039208220.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3b53f23d314afd39ac26e329d9e5de2e/runejixofazabuvumixu.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/nugekajarinivujenumopu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/adc4d4447a98a49ba382a0575b598603/65274684085.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c87e13d7d---sipifixurelal.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ofbmuv7knq5hea45kmov17nipb/gurefojisopezoladelid.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2be95324---gevamitukaxawomumig.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/jadikuso.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941eb1d7132---levixenajuxedenazexalebu.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/449385973.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/rerisarigejanexuwota.pdfIn PDF document text
    • http://df-foundry.net/d/files/62237100223.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/af7a4b862136bd8be31c022bf634aeaf/lagowewonu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eea92a552---jowakuzexemopeviga.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/16151430494.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/17614937993.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/71110053969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=time+master+pro+from+korea+amazonPDF 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_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 17380 bytes
SHA-256: 1dcb1b56e1ebd9e8bcec0afb56a54d7c0e3cc774710a5cb15a4a51771276dcb8
font_02_sfnt_off00015082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15082 10588 bytes
SHA-256: df9387fabdd01d9f96dc27c070cb0739cfdd3f6b8f691161298201ba39f84eea

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