Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f28c3369b31979…

MALICIOUS

PDF

444.5 KB Created: 2022-02-01 20:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-07-01
MD5: f1dbb558b9fc21efd8354220860474b8 SHA-1: 2c04afc598553c78033f3f8cc3dc9a8b771d12ef SHA-256: a4f28c3369b31979df671f5ecbe13ba1c4419576aff1b673efc558ea57c64bc2
136 Risk Score

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4612

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://mifuj.co.za/XSRYdR1H?utm_term=iphone+betta+fish+live+wallpaper PDF link annotation
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/92719325613.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/setewuso.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/rapikakekubijeserot.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/61956011502.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/vaxikorokukevaj.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/divuraf.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/1984633032.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e68323744e3---76316565955.pdfIn PDF document text
    • http://17njl.com/userfiles/files/puful.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/junozolinomakagewofutesuf.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sukuguruj.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/guwofeberik.pdfIn PDF document text
    • http://cbstav.cz/file/17287128426.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/50802957443.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2c3959effcfe3ff5f2242e3bab20e649/biwugelik.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/25824364456.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/47853294694.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/ramekav.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc4ef5721c---56478915784.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/zapuzikoxegawojexedeg.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/91701082354.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/pevobaxofubof.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/remobovuwuxa.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/rugajujixojupekesag.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/repabedojoripanovozekose.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/72023021996.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/jakabopiw.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/490496332721ae4a33897ca1c844d3eb/46744442504.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/bekepurepabinorigukomiriz.pdfIn PDF document text
    • http://evola.it/userfiles/files/43966440152.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_off00062dd6.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off00062dd6.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00062dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DD6 17276 bytes
SHA-256: 65dac3834879d51e7f0cc6ca8b57967f07238c0a062151be31dcd0a016b268e7
font_01_sfnt_off00065aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA5 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9
font_02_sfnt_off000671bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671BC 30912 bytes
SHA-256: 7c3b28767abc3d8e8500b72a07726d8288da4aaacf84ba635dc2bb23bb3d2d08
font_03_sfnt_off0006c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C984 10700 bytes
SHA-256: de0629d801705b5953a58d4cd372ac85d1c3c3c5fc300e1e5df790694ce2527d