Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ff23c47e5a614d…

MALICIOUS

PDF

260.9 KB Created: 2022-03-19 16:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-07-02
MD5: 5febcd2dce218b6ffb886540e190faff SHA-1: d1907127a8b94600fb6da723f859273a93890dbd SHA-256: a4ff23c47e5a614d28341fd375482326c9fbdbfbc57142c55f7e1873d8706eb8
166 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.6870

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
  • 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.
  • 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=roman+army+worksheet+ks2 PDF link annotation
    • http://zeguvietnam.com/uploads/ckfinder/files/mujolabupokalopevano.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/mixovasezulowabonofogale.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/162019336aac66---nerifazirovorazadusa.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20220206052616.pdfIn PDF document text
    • http://candientuvibra.com/images/file/rowonozud.pdfIn PDF document text
    • https://niceppl.com/images/file/mosuxokinivupu.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zebebeta.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/birodosivapifan.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/vawapelukabarek.pdfIn PDF document text
    • http://labotinnghia.com/img/files/vefobejivosabis.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gskn963ni5udts9ejk9kveb0bc/xojitid.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/pudaweta.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/80745830159.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/dozatedikelezir.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/gakojokisojurafalegug.pdfIn PDF document text
    • https://sobateracota.ro/mm/file/radure.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/47682551107.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/67389696743.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/nedap.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/dimadejikedibuzu.pdfIn PDF document text
    • http://jesupraguefilm.cz/pic/files/nuxaz.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/19047419451.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/sipikewalujakopisivomamaw.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1621c69b311a3d---85271247281.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n57e5t1mdsg8a5rgmf0paq85j2/liwuk.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/sefij.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/wazukulebubojizix.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/24371256978.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/042300004042.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16227af67457dd---82701668429.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/66265437462.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/sokifa.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/46011252603.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/jivejerosemubuwabunulog.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20220213_102320.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 extracted file (font_00_sfnt_off0003a4c5.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0003a4c5.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003a4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A4C5 10692 bytes
SHA-256: 581a9a95f9d8482e8bd5d54f024c6f45204526067166f173598bc737cfaeea80
font_01_sfnt_off0003bd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BD4A 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9
font_02_sfnt_off0003d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D465 18212 bytes
SHA-256: 1d931068a0a7119f0a3408a76f82017fe12c7870bb947a8c5273fb8914eb4c16