Malicious PDF — malware analysis report

Static analysis result for SHA-256 5526d99c0e836f2a…

MALICIOUS

PDF

248.5 KB Created: 2022-03-25 03:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-05-19
MD5: b252ad7d022584b75c37f3bea6100b65 SHA-1: b9761ae8310897a36430de98d5a89b37cd0f176c SHA-256: 5526d99c0e836f2a262807d5b843076aa1e340a6664878b4b85c68f504999689
166 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.6903

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=problemas+de+ecuaciones+lineales+de PDF link annotation
    • https://k-barrierfree.com/FileData/ckfinder/files/20220321_B30CF03BAEA32540.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/judolufowikolazojif.pdfIn PDF document text
    • http://valburysekuritas.co.id/upload/files/dajuvuwivaxitadabafos.pdfIn PDF document text
    • https://www.afsti.org/admin/kcfinder/upload/files/86328399998.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/67836022435.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/162056bf49d07a---18856168201.pdfIn PDF document text
    • https://yello.gazzeta-group.cz/userfiles/file/37434477004.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/juburukezakewixor.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1620e10bcb0584---51271975445.pdfIn PDF document text
    • https://wildnaturetravel.com/File/tusibukunewagawep.pdfIn PDF document text
    • http://www.kedokteran.untan.ac.id/asset/ckeditor/plugins/kcfinder/upload/files/timerogenerunodo.pdfIn PDF document text
    • https://mannlicher.hu/admin/kcfinder/upload/files/6699895815.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1622ad8c1887bd---24309579080.pdfIn PDF document text
    • http://smartbazar.online/app/webroot/upload/files/45593368850.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/15972569616.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1621e4eecbec06---xupunolujejomiroludomug.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/ridosod.pdfIn PDF document text
    • https://www.magrinienergia.it/_admin/kcfinder/upload/files/vunitebanu.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/53968562052.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/vojexenoxisopumimini.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/ruxitu.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/vezixi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16228b0f8e1a49---posevodisenonewupijatipel.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/92483339526.pdfIn PDF document text
    • http://lse.hu/userfiles/file/vonusobe.pdfIn PDF document text
    • http://bandodesign.com/assets/ckeditor/kcfinder/upload/files/judurugadinatijofoze.pdfIn PDF document text
    • https://www.xtraordinaire.org/web/kcfinder/upload/files/pekivujosuwavupokufuzoxug.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1623d003aa5655---fobidagibigit.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/kupibinuwikijurusaj.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/89852522443.pdfIn PDF document text
    • http://ferbogar.com/assets/kcfinder/upload/files/48609947704.pdfIn PDF document text
    • https://imperialbroker.it/userfiles/file/46912323792.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/36783488879.pdfIn PDF document text
    • http://www.aqua-systems.com.tw/ckeditor/kcfinder/upload/files/53407818179.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4ec74ir28tlre1un6hdpsqt04k/91756914891.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/22fcu6udfs6guh7prv4ajaf865/kekog.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/gawodamole.pdfIn PDF document text
    • https://exxel.cz/kcfinder/upload/files/87578603304.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/79322467863.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/26856647859.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/49781551338.pdfIn PDF document text
    • http://instalacje-elektryczne.net/ckfinder/userfiles/files/61605910014.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/dewotuxagusanotutelisubed.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/yU3upqbikWRC.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/33080950457.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
    +4 more URL(s)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00036bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36BD1 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9
font_01_sfnt_off000382f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x382F1 10676 bytes
SHA-256: 8acfa16f754aa03ee0cd238b3e4ed205a4d1b5d0c5e1e29a6a381daf14521c0d
font_02_sfnt_off00039b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39B50 20956 bytes
SHA-256: 38f82619912f63fc2b9c4e08d52253b730baae55db4b3b8542010b9495364d09