Malicious PDF — malware analysis report

Static analysis result for SHA-256 6725c4828cfb305e…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 03:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f48da84bebc58a997db606689bbccbd7 SHA-1: 3b0561ee4eaee8d7279682c7683597c6371e16f1 SHA-256: 6725c4828cfb305e9efe0db119905d4197ec8cfb3abbedd2cea245a2a1c5dd75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://huntic.ru/uplcv?utm_term=how+to+reset+data+usage+in+android PDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613212ec694d1---kobezen.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/88728314877.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/rakipavuxakemaforizo.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/mitixatafixoxezejuve.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de44116874---bosuwogudosukukulare.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/93493477063.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/16436963266.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a9020f3ab---niwodiwe.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/83854792775.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/dl9i8e46clhgu8p5gfepmpa7cj/regirorutepixeza.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f178e81855---kavimepa.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/sotemufenoju.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/98202084013.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/11538512805.pdfIn PDF document text
    • http://jfe.hk/userfiles/newelurulukumaruwefori.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/55209993906.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109081534343103.pdfIn PDF document text
    • http://101balkon.ru/upload/files/litobofefaxoselepokupidik.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210929_D5D9743AE99D8956.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161534e45139a0---43466677903.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/juwovefunejuloruj.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090708465621.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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 10552 bytes
SHA-256: b93a5fc7e493345c4a9f0167a8bc8db97b656a9e92cbf1e278be44955029709e
font_01_sfnt_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 17028 bytes
SHA-256: 3f79c632e80f5a795fa88ca6181a632600dc600fa3f81b9de2a4576f04fe97ba
font_02_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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