Malicious PDF — malware analysis report

Static analysis result for SHA-256 637b9049f163b5cd…

MALICIOUS

PDF

79.4 KB Created: 2021-11-06 14:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-07
MD5: 6ca54cff86e08a0101fae687d6f95e0c SHA-1: 67760a941a1784febd8790dd9d9cbf228c3b0894 SHA-256: 637b9049f163b5cd067927ce80ff97a44c1e21c98a0754fdfbdb8c141cd652e5
164 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615be06362919---ripunumefepurorowele.pdf In PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/zipaxuvuna.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d026a8b36---pojakibe.pdfIn PDF document text
    • http://wixoon.hu/upload/file/fewalozuzimimawesajomujig.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617b5cc664ed5---54696918270.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/zajofeginufigenedox.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/89908407274.pdfIn PDF document text
    • https://cathita.vn/upload/files/zexosimugo.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/zozileteliwedezokazipo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/21295f8b9bfb1822193c4b4a1fb4cb04/46689302564.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/549617515.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/54592653306.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161574104e9304---7944988057.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/fanezajozakafo.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/75406143707.pdfIn PDF document text
    • http://cartopack.be/Images/file/bipufowekazagelugufasixov.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/84227139181.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/fafuvo.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109291900078562.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/gebimo.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/nafukojasujuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=bella+ciao+keyboard+notes+easyPDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/75595815013.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 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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 18580 bytes
SHA-256: 67c692351ed8d154c8338d6a46404add254aa957c40a55446280f5b57a91bb1e
font_02_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 10760 bytes
SHA-256: 565856cf784af84d11647119960b1a84b5a923f1f44d425c76c6ee293f54acbf