Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee0b4cc27df876b…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 14:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 62a9ce4e4f33d9b44e93f692bc714fdf SHA-1: cac0811001e4176a7dae461c39561ace1dc970fb SHA-256: 6ee0b4cc27df876b07256a8aab1bfc0343f610e06fdfea9ad9f79124d4ce62c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to artificially inflate search engine rankings or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782508ef277---85643607729.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160971d8d960aa---fatogasarabokejaw.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/36050855494.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/telixukurawenigap.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vepiwunigixovud.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfb02007c---lolujigotivekizokawimufud.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/9428856023.pdfIn PDF document text
    • http://abpaluso.com/upload/file/jijifinuzisexiponere.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096848a0562d---losofifegufej.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e2fbe8fe---5800678635.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9d1eb27b---sutifinipifisedur.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/sopobe.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5845d6e4fb---21529514843.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ckmrjgjplj7ptstocq9rflbndd/dupudukavigoge.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4606f3c4---40051192371.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789499a93e9---19579251611.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c91749e7b34---46206210609.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ab13a6a92---59845524136.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c154371b9b---15364366941.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/91415374937.pdfIn PDF document text
    • http://ecole.ru/text/images/file/pevokowetaku.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/98149332588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=80+bhd+to+inrPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7df6a4f7b---fipetitolu.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10212 bytes
SHA-256: df5afc7273357af150ce9e8124091bcf1f0129058498bd794e22c93a5a802495
font_02_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 16300 bytes
SHA-256: cb22297cb345efa2b973a5529f7d34f362c2fa401ecec879e64cb16b1dda6a81
font_03_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 17624 bytes
SHA-256: 43b5a32e2068058756e714e696941733239831095dee70082dc1af107c16a60e

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