Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d66658704e0503…

MALICIOUS

PDF

89.7 KB Created: 2021-06-25 22:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8376a94847aa45285926fd554ed4bd1c SHA-1: e329796ead9624893a1dedbcaa39a2f64bc9b6b2 SHA-256: 21d66658704e05033374d7ebf1e82c34f6006f80bd74bd812c84b7165b21acc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. 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 http://garderoba.sk/images/_file/20303193650.pdf In PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/61428884526.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b5cd71ad---paluj.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/92521893601.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4fvejiqdbmluhf83scud9pmnce/80917577843.pdfIn PDF document text
    • https://oversaslogistica.it/file/33067727318.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/40881667576.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bb08c98c54c827b3cd2c621127dc6242/zavexumutis.pdfIn PDF document text
    • http://bronia.org/userfiles/file/jeruwe.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d2e26dc1---zunegekuduripej.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1hmm5re9n3rg6qlgrapodh63gv/soxadusolexunuwine.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/23055413772.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f842f1898---muzobuvonixa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608155db2f95b---zimadizoludalobafadudop.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d50f3940b3f---farilubabezosezilaw.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce54b6af5---95158000094.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/58701725752.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/no22a3jaqehlgq2bddau6tu592/safuvabaxufon.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/67416368034.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0433221fcb---24397858268.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/48649557038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sack+of+goldPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 10124 bytes
SHA-256: 83a30a762c8027c758cdb27771144ed3a8170d2766aaa9041962a7c14e907146
font_01_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A08 18148 bytes
SHA-256: 4b8465d66fc32a77a334c33635c5a830694a96e1274765485306cfe7818b0e1c

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