Malicious PDF — malware analysis report

Static analysis result for SHA-256 4455b9acc990a8e7…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 13:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 9f4baaa188f036e72f495d4842b65d95 SHA-1: 39964134b80418e9fe0c272947696928bef4b47e SHA-256: 4455b9acc990a8e7795227b1450344fce360aa261687a56041423a8b0bb05bff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://lifeteacher.tw/uploads/files/202109041326561372.pdf In PDF document text
    • https://branchennachweis.eu/userfiles/file/40643188346.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/44025226282.pdfIn PDF document text
    • http://njxinbell.com/upload/files/zalajomomineka.pdfIn PDF document text
    • https://clinicscrm.com/img/files/lamimelotajubuz.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8b6e6bdca0c38e199378ee84da7d08aa/xusijoluxogawa.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/35262251664.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/7238984038.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/72418429687.pdfIn PDF document text
    • http://sial.pl/galeria/file/85171953182.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/rinuxupuv.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/pijamutunakerabizagigegin.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd248c5240---fatofadegumega.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/vamok.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/momudefafimodofelogo.pdfIn PDF document text
    • http://zaiger.ru/img/file/55575739488.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78067dbe6---zupuw.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gg03gv3g2a12pqnj0qe2c30uup/zozupogowavafuxor.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/20998056110.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75d4326e3---papekofomisuranaf.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/88743222373.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/xexujovanubesurevupu.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/65797429110.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/95904865224.pdfIn PDF document text
    • http://bienbao.net/uploads/files/fexelomuledapifejoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=present+perfect+text+comprehension+pdfPDF 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_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 10780 bytes
SHA-256: 13e85c62f7cc90fd2fd215a18f0280593be792a4682eedc21a4091ef5583f67f
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 17704 bytes
SHA-256: d5113517aa24aec275466ae889a91bf187269619b055e23293f881db4fad8b3b

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