Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b4f8c67505e179…

MALICIOUS

PDF

115.9 KB Created: 2021-07-08 01:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 53e4a4c43d280a22a82ca4febecda767 SHA-1: 58007a3b5bff84d7aa01c7747a9e55d6a0becf20 SHA-256: 47b4f8c67505e17924de21275ec22e1151e5a6e067190429ed200441668581f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to host and distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/99e029b388ab3f8cbc565ff07a78fe86/82343061364.pdf In PDF document text
    • http://szyuangang.com/UserFiles/file///36826065139.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/tawimubixizufe.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/bmckkn6ror0v8vt242dc9j24e4/52539518249.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/gudagizegawedukejaw.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084076e1f1aa---mekizaxumapogirudafa.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fu2s466548dmvbupdr7a1aagtc/depojivovuvefuboj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077270fe0c94---pezibimesibesivefaxibukag.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d8c47d8a5---fesebugaxulubun.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d5550756b4e---10701529366.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/beganibizitenifufan.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8709f36f3c---74140621814.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8cb608b3eeda07a05449c632e885d6a6/satuvexisa.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/92hpmn9ejbgf4dchnr8i7nd0k3/12208323692.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afe5a9bd6fc---muzerutusitagaj.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/gobaxaxexolosimulalolevik.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc0a22841---ritikugunawot.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a02e833b8---76806160499.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/nodisokugix.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160de26bfc0d13---raxikinuputotij.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/87ea40f8acdf8ea88ef8461c2176b605/16980464630.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/jumixokitezafolejodetexij.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9e4ddf8cf58081ad34fcb5eea4bac164/10353414014.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lixukipapopanafivevagi.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/55461770868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=furlough+employee+meaningPDF 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_off000163df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DF 18212 bytes
SHA-256: ff810f3d16d1d52f9ea95551cadcb627af4472a329a840e13ef07c377739e91f
font_01_sfnt_off00019201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001aa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA18 10624 bytes
SHA-256: f9995c130d4c79209854e3fcac93605827acfbc353720bd9a29c183b9bbd6889

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