Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c51082be06e2b8…

MALICIOUS

PDF

275.3 KB Created: 2022-03-10 23:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-26
MD5: dd618ef9dd37c227b2cfa341b8ba980f SHA-1: b6ee4cf81fdff5e869468760cf5a02732b479ea5 SHA-256: a9c51082be06e2b818c651cb534ec2568f71e93755884e0d3a27f14eb771a2ed
166 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9562

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4d9b105c222e53d29c2f5d383eb8907a/noxovejepesotal.pdf In PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/kimisakigamefexajamijinu.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/37029111640.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16200826a895ec---41284288866.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/80600345245.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/17987713549.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ms7asodo2871t8l3u8kpbqfqch/jagasiwufodesosorenu.pdfIn PDF document text
    • http://www.alite.com.br/assets/kcfinder/upload/files/fefizosilemefedeb.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/biwunetuwubokilinosuj.pdfIn PDF document text
    • https://pmb.unimal.ac.id/assets/plugin/kcfinder/upload/files/xesojelamavusugosaxujute.pdfIn PDF document text
    • https://midlanddevelopers.com/backend/web/kcfinder/upload/files/pukoxavixalazesida.pdfIn PDF document text
    • http://zeci.nl/im/image/roribusikobugatitosof.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/fb0fd9e3d5c81440360d037ec10eefbf/75653441137.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/minenijiv.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/lunav.pdfIn PDF document text
    • http://wetravels.com/kcfinder/upload/files/jofojogujosiburaw.pdfIn PDF document text
    • http://www.debreceni-fogaszat.hu/js/ckeditor/kcfinder/upload/files/vazikotofe.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/kokinepagaxesozovili.pdfIn PDF document text
    • https://lovig.co.za/XSRYdR1H?utm_term=apache+ant+installation+guidePDF link annotation
    • https://smartmedia.ro/app/webroot/files/userfiles/files/rorufirokirodixafepifi.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_off0003e321.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0003e321.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E321 16840 bytes
SHA-256: 81bb02b13cb780f6e01b24b06fe47e5b3bac30f633f7bc4f0057334a20f7746e
font_01_sfnt_off00040f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40F35 10772 bytes
SHA-256: fb35fee3497ec89224ca45ff41f1c8c0911c30f0de25a9ad9af7c3642251fed4
font_02_sfnt_off000427ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x427CA 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9