Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb28d87245482d4…

MALICIOUS

PDF

435.2 KB Created: 2021-06-30 11:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 308e21254cd9348ce836dbf1eb3d2f4b SHA-1: 0e0c7deb552ee99b5679810407244bd5684cf96b SHA-256: ddb28d87245482d40b66faf94169dc5bf7e4535e8e94a44cd7e1459e69631d27
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains links pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The use of an SEO redirector further indicates a lure to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7162

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/22eacc770ad1477d08ee0e17fe6f7cba/84807024219.pdf In PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/41399e601c10647c4408a9dcdfa74df9/35058563821.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/838262da3ac3547ed8a8c07bd2754288/95284069885.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/gojefekafowawuxaz.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/55fbc289bc949abe260117b43b4b6c5a/bilimovasetega.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c538359e9a7---31592993638.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d548e2238---17358103397.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/23269950146.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608159c010968---62539674490.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab54173c3bb---gejofomumosekojuvenomule.pdfIn PDF document text
    • http://martonelektro.hu/files/file/tesefali.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4b38ed0a228871d2eddd4ace44388636/85298127220.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/251186180b6b2d0d901bf1c010cc0bfa/vedosisu.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/fazume.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/31770101489.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/68980856547.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f8e698e426a99b3fc6b24a88d5dbb4d9/rukabiziref.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/67782062445.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/coacc526gm85g4do7hkm5it34k/faxuvuxenubikelazanusunek.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/15567243716.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607862b2a203d---wojifojib.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/xoniwoxorur.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607374a36bf77---tewuzipexeli.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf3c62b228---27615062406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=game+of+thrones+3x03PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0006444a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6444A 20280 bytes
SHA-256: 9fb876a8d322e3ed0410e2f0878e3ba1a8e856031c1795d25c9c48246f167eaa
font_01_sfnt_off000675a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00068dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DBC 10776 bytes
SHA-256: 9dfebcac8f756cf272fd8155908d889883fd32d8fcd09adba8827c3d510c4ff6
font_03_sfnt_off0006a672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A672 16084 bytes
SHA-256: a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2