Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d40737badb4ea3…

MALICIOUS

PDF

265.0 KB Created: 2022-03-23 05:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-28
MD5: 956721f9df4d45937376b522b17ede3f SHA-1: 9424bacc818774d75230bce21bfec446aaa36e64 SHA-256: c5d40737badb4ea3fd6cdd780d1601c448ebe34c0bec687c66625ffe488b8714
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to external URLs, including one identified as an SEO redirector for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7783

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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 https://sunuf.co.za/XSRYdR1H?utm_term=pdf+editor+to+word+converter+free+online PDF link annotation
    • http://weddingfavoursfor.co.uk/kcfinder/upload/files/vafibazu.pdfIn PDF document text
    • http://auto-berles.oldalunk.hu/userimages/files/12748468162.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/70272375176.pdfIn PDF document text
    • https://sangogiaphuc.com/admin/webroot/upload/image/files/16577701306.pdfIn PDF document text
    • https://reytrans.es/kcfinder/upload/files/tulamilesezodusojakufikub.pdfIn PDF document text
    • http://artio.pl/files/files/kidutexumumajop.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/pemizisetexibujiperas.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/kidevobo.pdfIn PDF document text
    • http://personaleducador.com.br/ckeditor/kcfinder/upload/files/44732511422.pdfIn PDF document text
    • https://privatdaniela.sk/upload/files/22354095741.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/40060371163.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1620ec4395ea15---24833291281.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/70183791241.pdfIn PDF document text
    • https://avenue102.com/uploads/file/kirasejutogagajedumetu.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202202090713343208.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/80517729989.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20220314_6C3EA2E325671832.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/fexoguponajagimoporunuma.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1622f020aeddf1---54195655066.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/fetonogafivilomem.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/67997632473.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/wulotikefe.pdfIn PDF document text
    • http://rococosofa.com/files/files/17142252933.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/fovuse.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161fdb4ee03263---94073922955.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9f6da61dca525db68091cb20770120e9/1355061506.pdfIn PDF document text
    • https://frischgeschluepft.de/kcfinder/upload/files/badasiwiwadematawad.pdfIn PDF document text
    • http://printways.filtronro.com/pa/trainstation/uploads/image/file/85247334246.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/8403009995.pdfIn PDF document text
    • https://www.miroku-mfg.co.jp/system/js/kcfinder/upload/files/79600067223.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161faf491b79a6---95013556116.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/wedefalorej.pdfIn PDF document text
    • http://ustunongel.com/image/files/dowafuwofepiremade.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_off0003b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B078 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9
font_01_sfnt_off0003c798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C798 10292 bytes
SHA-256: 2d87b3a9f45408dcd378ae12277baf39fa5a63a398765997ebacdb3d942fef2b
font_02_sfnt_off0003dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DEE7 20092 bytes
SHA-256: 5afb8c34d7a971bd802da5769f5bb1f0eeedb9bc9c11503ec3416c6f90fd64da