Malicious PDF — malware analysis report

Static analysis result for SHA-256 0681099ea52b37e4…

MALICIOUS

PDF

99.2 KB Created: 2021-09-06 16:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4384a6b01a45b88f7a1daa0caded2815 SHA-1: 7e9da882ef623c704590e9a8fb7cac342ee5a483 SHA-256: 0681099ea52b37e445ad147c4840daebfc3c9fcf006cfdec6521f424cff1a1f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous external URLs. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The document likely attempts to redirect users to malicious sites hosted on compromised or disposable domains, potentially to download further malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nomylo.ru/uplcv?utm_term=sap+lease+accounting+pdf PDF link annotation
    • http://blevy.com/ckfinder/userfiles/files/xukijinudubelorisoxojuli.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e207476f6---somewosozulorebimifeneto.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/77260935468.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799daf05d79---19884300183.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/o8hhp4e1oh3es4ubhnpfevsbo2/47263988001.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/vegagiritifafiziwuma.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bca6d587381---zawokojevi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/06e1nrohrpjaphkv9sdjvqfkbh/13780513805.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa7bde2bd4---wofuz.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/2359528423.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/vexaridinebapuza.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/laropun.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/d775mdlf2h9cjigcda6hr4cfr2/8745135508.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/fcbb378e2f3f1c33404b782efa84639e/74179416888.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/67961660021.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d3v6iu8pq5pqjmg52l85fk8ft/nubaluw.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/83202866399.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/62884630063.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/15q8nft0hnpgof9giqlg81r1g0/39550666642.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161113ffe71aac---retumujigipim.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/zuzegalafikakilo.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/pojogiguwuraridinaxeriron.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_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 17384 bytes
SHA-256: 2ee1724bd6fbd8b48653a8268c97c5023ab91f9d70ee3920cbdfbc6bdb467133
font_01_sfnt_off00014def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEF 10868 bytes
SHA-256: 8101b5eb48cee60be7ad17d622e3a4210c54471ab0a7b70586748e4db6e4d905
font_02_sfnt_off000166f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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