Malicious PDF — malware analysis report

Static analysis result for SHA-256 286408b57197aed8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 05:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 987096e639afbb3b11181e172607094f SHA-1: 7dd96ac98b8db06ede346cf9f5b0eb770d975aa8 SHA-256: 286408b57197aed8bdb156afd06c345ef8523a55b1523d374848250fec81816d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bwawarszawa.pl/upload/file/wefimotiforewebolenefa.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611e44fa59d4b---ponozopodeliwifoxul.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b8b90233ae45306eec1ebade4a8ca1b4/maziponilomuvo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1f3db271d5ff85d728284ad6478b1567/52589130939.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tutir.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c2775d917---dotavaponelixivuvodavuwo.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/84861305067.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/neruwawodebilixanogekusel.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/6842154805.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/68021704136.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kumisasilok.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef15a3521e---foganaguxuxaxinabupib.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/4726260557.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/50079753776.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/49246919696.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16106d681e214b---85652078143.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/vikupit.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef64ee7cc---18536422616.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/i4ce0vfabbh62op7f1m4toksm4/simosilobefinireke.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831570d3ee---gigibakedajafivijesigo.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/nigurupunogegovinenojava.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/63153411643.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/36497963768.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/71084982051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=libros+de+emmanuel+mounier+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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 10756 bytes
SHA-256: 6998488ced6c1a72f9793b5b707f8a469c0ab3e4231b59b5d25356c7e5cbad16
font_01_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 21752 bytes
SHA-256: 92f852d6fbbc1819470be315b6ff05c1e886b9687d574b68837254a71bb132aa

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