Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdbc5af20b29a9b…

MALICIOUS

PDF

96.9 KB Created: 2021-06-27 07:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 57982e0d98c123e303f1a77488befb4e SHA-1: ecb24e5de2270853942ca14bdad2782df67610a7 SHA-256: 4bdbc5af20b29a9bd745b54184ef915414a2901f5ac9b3b919b86d605cc357d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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://khonggiansachhanoi.vn/uploads/files/xizefetorasoki.pdf In PDF document text
    • https://atrax.hr/files/26966975184.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/fumikofipiwozewu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16071323b16a55---88131211048.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608046e4e4c43---40704295784.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/87944172421.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xuguduv.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tageluwuzedu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5172a0aee4---gubowazukopasagejegepaj.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/butububazogid.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3qh5a5fjp65hvcofasjm98me41/79656307447.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/34c0e33df45325c87c5816fc2480f795/25524778803.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vivexunazazurogale.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/8436471391.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/golutigisawita.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tetonovumukozebirule.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b1bd2754---48576908078.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cede90f837---visurosikiravudafizegivub.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6b2f3db5b---zumijuxexoxira.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9987575dde9b1819edffd3d53decc523/binabaz.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/nerabilubagikesun.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2250efe31---gubokaxanefujujokaderuj.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cf98a13f311f5e85ddb0e146c2ae7e01/90049028977.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c4aaf4e160419bcf0b5ec31eb925de4b/rotibexelof.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/11c634719d66f028ec217a7761e24507/ritexafowavu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/agr5a87ehncqolqavbigfto56d/bajajewavabizujagel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+video+recovery+app+for+android+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 18148 bytes
SHA-256: 8ed887c151486f68a5a52d90f78f957f6a8546f17796864f71fb27341f92c725
font_01_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 17728 bytes
SHA-256: 03dae42d0499b9fbe37cdf5a5bf586ed338742eb9b980d4dc37d7ad93afc3e97
font_02_sfnt_off00013b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7A 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off00014383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14383 10892 bytes
SHA-256: 0fae164637dd1d14e468f19ed22eb9219f5478a83f375d488a24f2dc39f8a94b
font_04_sfnt_off00015cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1