Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4070323f552b27d…

MALICIOUS

PDF

76.2 KB Created: 2021-07-04 07:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8e6e9a3fe8cef4675ea2a00587cdbfb3 SHA-1: 6d21815e33733cb7180d0498614eeeadad32f928 SHA-256: d4070323f552b27dd738341496114ab7c1c2533b372967610a4436c3877de8fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on compromised CMS upload directories. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The primary function appears to be redirecting users to potentially malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://handinhand-daycare.com/ckfinder/userfiles/files/70279520201.pdf In PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nagubimesosonenim.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210613/0219581790.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85e774e92b---92079852913.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/84063497236.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/62517360655.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076660954062---refabeguvil.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/kejolapivatuzujuje.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/subip.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b650f2f5bd---91011899099.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/37776584933.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f4967ede3b81a5c6e9f62a50edd9c5f2/pekesul.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fi70fubjfqk8j3sdutidgaia3t/5425028602.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f74d16830df8f3e6d622204cfddaab8b/jetomupoxojonanivudazo.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/99452251985.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/92849348891.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/fuxiruvizaxovefinuno.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f45e4cca---77295725485.pdfIn PDF document text
    • http://calisnt.com/uploads/files/29429282625.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/23251869466.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/1dd1108d10ee3b5345b954b2a78a5e46/lefigasejorake.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6acdf91ada---xazifaketuponigigatejebur.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5a239bf7404312afab16c7b2eb7081fa/66824142685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chlorobenzene+is+less+reactive+towards+nucleophilic+substitutionPDF 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_off0000c517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 11092 bytes
SHA-256: 39533633dac761dcea52fff47b5ea9d579a5080a8f6e97496006a5dbb29cb65f
font_02_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16956 bytes
SHA-256: 2b998f6da9155789c7ec8cc59e3d8ff291c1ef7322ebf1e030ccbeb50f2557b3

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