Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfa6f26ebda65a6…

MALICIOUS

PDF

80.0 KB Created: 2021-10-21 03:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8cc8c61e2c5a9d75d3b60bce5d7113d7 SHA-1: 5a5c0421d7a13659542b7d366773280ea7dabfbd SHA-256: ebfa6f26ebda65a65fc0ebff2a154042376ce5f07b1b9183da6d586864ef0015
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dui-antidote.net/images/userfiles/file/76627810783.pdf In PDF document text
    • http://sujoydhar.com/userfiles/files/60801511071.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/93422427046.pdfIn PDF document text
    • https://servicepapik.ro/files/rokaronozuwadu.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/senixedum.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/22553908962.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/aca6ed4a0f417b97de46bbef1f52ec57/vesejas.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/53136637247.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/40349695298.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/73158862019.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vibogumom.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/95613624061.pdfIn PDF document text
    • http://biosite.ru/images/news/file/12525982565.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/57795228418.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614168895bf18---bapofijopibejupune.pdfIn PDF document text
    • http://huiking.cn/uploads/file/181156235781.pdfIn PDF document text
    • http://exima.kr/userData/board/file/pesanurejedixis.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/33656233182.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/dokazexapabolajizupo.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/xaxiwapepelininazixuzup.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/4808557746.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/sinudubozolojofutovazaj.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/36564552047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=counter+reformation+of+the+churchPDF 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_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 17936 bytes
SHA-256: 47988cdc695bfe1f945be5735f6b627da15a75ecf81de78c035573bbf4a871c1
font_02_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 10516 bytes
SHA-256: fdc4dd17d73a704b39b45e48f1a4f4f25b768141bf998fd2fd8866f76b4c7170

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