Malicious PDF — malware analysis report

Static analysis result for SHA-256 2399b9ecccba04a8…

MALICIOUS

PDF

70.8 KB Created: 2021-06-06 15:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 72569287628ea11e45fba46f724d87f3 SHA-1: 2e62fd47489550fe2f5daa946d33ef0eef998d3b SHA-256: 2399b9ecccba04a8205f2de814eed87fe71ead4fe8fecb8792a3feedbb1c0983
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the overall structure and URL patterns point to a lure for downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=download+library+arduino+mega+proteus PDF link annotation
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160833e68d92b4---mefatizinejupu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f0b9856cdb80ccbf929372d109b424af/zedurudevawazufezoda.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/3867358705.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3d27c01cad4afbf029f09e9b6fd265eb/rapomedov.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/10952173420.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/latafuberuz.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/59105908842.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/guxixusizijisefosuforegi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e02d4ca3242a62ea35d5b2e9fa67d235/97168378586.pdfIn PDF document text
    • https://tonitomov.com/picture/file/41026549023.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/aba39713b190506000fc33dd85e8220d/fokuruwoduvesajor.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/72101305627.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/18015419356.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc9ed436f---tekuzaworaniroxowokit.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/femt3sfc6e7plq5tphpjj1jsdc/62044179914.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jumitawijebobipuzo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c1419cfcc2f0c9cbd6e0749042eba6bc/81141857900.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/tulasut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 5612 bytes
SHA-256: 85dbfd865b10704ddd2b7dad90327bbf3cdefefae58367df34caa86c8609dce3
font_01_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 10964 bytes
SHA-256: ecdb2747b4a2b21e476865a6bff9f682f4e0030ec24af1b495473354cc3d66f3