Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86dd6c630a589c5…

MALICIOUS

PDF

88.5 KB Created: 2021-07-27 15:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9902ea24ba5f91c1438b53182dbf7fbd SHA-1: 732d212049c048a16c807b57224818ead6cf23cc SHA-256: b86dd6c630a589c59da4e11c3431852b183fb578d8e3ec7c326d037fd6d71ef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links pointing to websites that appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the detected heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/1fb67fbe5ccc1630849918b151d43bf8/lutosozolutefebafirajub.pdf In PDF document text
    • http://4bx.pl/public/file/wepexofoguza.pdfIn PDF document text
    • http://getem.plfiles/file/2760973793.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/dixezusezebomu.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/6070884921.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bef96da1353---sukemesozi.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2vmkgf3l7u2ajnog4skinco1ek/55135262949.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/36996969963.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/fb1049d90726e959cadb3d3c451aab57/xonep.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/nunofo.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/nuwasufumag.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/nmafui7cjiou7pfmhkb1n93de2/98260430467.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4ge6hr0cn9qh1fgkmjvhv2kie2/62809409402.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8ce9779b71c6eed97b4258a2f6d4ad66/delanuvitokowosijaruv.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/lijexabososesopojuto.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/genow.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6661340de---mawutavibijusor.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c283ace0---33584818308.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/4980108480.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3359209874---56223549953.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd7f05795---miwasimasunededaku.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6220ec067---89582314511.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776d40316d1---99347989151.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/a43d6312bc60882d5d28ac27a2f14b53/rudofomalojexasobeleg.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/83658678344.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/durofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+compare+likert+scale+dataPDF 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_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 10740 bytes
SHA-256: e88e5c2fd5b2e5e30bf9f4ca0e73610a03c6aa25687d3723555a17b6c6483745
font_01_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 17796 bytes
SHA-256: 85a36c0301b8cb89ac9106e55320579f972d753368900aebaf9197b1f3a8a056