Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bc7f87d8cf2cf6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 07:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcc6d6f2fef9efd510a1fc001f0f1610 SHA-1: 9d8272378640aa6efe6f798a72f816f69c710a88 SHA-256: 54bc7f87d8cf2cf68f51faa6a83047f35b54df69699c8b4251cdc3b43a2da36b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=boku+no+hero+academia+season+5+episode+14 PDF link annotation
    • https://cyklo-wellness-penzion-palice.cz/content/37310280056.pdfIn PDF document text
    • http://camonetinternational.com/files/file/81884893783.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/30907395597.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe14f41a17---razomo.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908204518625052.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/65090362552.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/86076791461.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/10102396650.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/vilijapalaxomub.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ois67i4n55c41lfrvu672m0r02/nogumusevamulo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e083b8febb33769c7018bbfff191a0fa/pifokonumatugaferawog.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210908120150.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/jesazetipavodetamu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jkrt4ctpvlt2c8tokdlu2n2a9/fasixageb.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/zevowotilusu.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/wijudegux.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcf2a9a68---kowigiwurejojomoxu.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/lezeje.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/jefuzu.pdfIn PDF document text
    • https://mklaassen.nl/images/file/53201803838.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/14298481734.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/lowuwegelazeladuriwenug.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/34658518154.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/44561238934.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/turejalip.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_off0000cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 11144 bytes
SHA-256: 1dea6c650f7b217a3bbc7b860a13c1766c0cc27384b49ed7fa512a76758b169c
font_02_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 17540 bytes
SHA-256: f67e996a71f659236fc101e92806a0e9b76d885058e16899f4c0577c3ad2c3af