Malicious PDF — malware analysis report

Static analysis result for SHA-256 989f7cf50c39f6ca…

MALICIOUS

PDF

99.1 KB Created: 2021-06-27 15:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cbdc158f5b8df32b34ad3c69ae86dffb SHA-1: a8d1f51ba261537c059bcf244f0cb8bccd903dc2 SHA-256: 989f7cf50c39f6cae7c713ee8ec51948ce34afdc61552a50163dba87b3d65377
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec53459a9---vabavewuz.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f764206d---68558674978.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/riwijisimezokakeg.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/61916196805.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/wekiganomejo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/51b215e7db9aaa2c41efc35fe130d92d/55124889390.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/244a9fa9861f6ea89e81c0a10ac77edb/talerid.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/94517453413.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/62f5aae69f22882d7f927fed4ae8173d/96340389617.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbe209e9e---46768701220.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i88n0pgp1l8vnfd2aibsej3io4/3176726481.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61eade5353---24116114089.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fadbc31adf0dad1425d0cfed187e14c7/61980546179.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/04f3834b9e9422c510f8c7d11af5ba40/futodukogubevofezebux.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/188ecd7415c9abbcf9426ba57117afdb/xuxusep.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075019f0f73a---sujapa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/860b88cf2c46ac364e9400ae590717eb/32196514604.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/26753592056.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vedakumil.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pafedexeluvor.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6aa1ac02dea0f42aaac3dfb8f3c013c6/vusozuputo.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/nawox.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089ca69b9355---72452247510.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27bbeadf2---pobivajekezotojuwoselur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+human+brain+in+photographs+and+diagrams+4th+edition+pdf+downloadPDF 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_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 11312 bytes
SHA-256: 671adc6c01f24648dd626076be30f734783ef4fd38f1faad24c19f40eb48092e
font_01_sfnt_off00013ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD3 17136 bytes
SHA-256: d21f4d45b006add39f56604c67642b20b446faebaf79e6752c5ccda7b331b926
font_02_sfnt_off00016678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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