Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb4a11ec8600732…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 12:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f79da05b85d88a4915bd8c13a30e3113 SHA-1: c7c60d21c3042e387b8ee08b7dbbed44558d5347 SHA-256: bfb4a11ec8600732905cb6af3170bd9c99842772bc81f34ffc563590340e3433
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple external domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ludifrance.fr/userfiles/file/kegowek.pdf In PDF document text
    • http://www.cavice.fi/tiedostot/files/14766621632.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/10774532038.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/77214315810.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/50899032498.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c872d122c87---47948009892.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/10483170716.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/a6m5rg1vl5ji2rko8achij5klp/bomuverirefizezuxu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/64108493364.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4bf027001---damos.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/nubulinep.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966719f38f5---51717395032.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160872a90177cc---mosado.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/95835155856.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/rerejuwapova.pdfIn PDF document text
    • https://ferropula.hr/files/bitiwapumis.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/daboropodusarimiwabon.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e56c673859---76732250677.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/sotakorakatuwozot.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926acbc33b4---51326069592.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160726c70e6f3a---59803073815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ppt+and+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45A 16788 bytes
SHA-256: e399309fd69a7b2f6230c0e8c3603c6fdbaa1ef99b40b2844ebafe04cab753e6
font_01_sfnt_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 23132 bytes
SHA-256: c33dc7d643229fdba3125e6e3fecfbda5e6fa1ecbf1379ed2394bf442a31942d
font_02_sfnt_off0001162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 9832 bytes
SHA-256: 9688cf26aae411c7fde2974ffa709ef99476c317af1dbedc7063281af3b1cd51

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