Malicious PDF — malware analysis report

Static analysis result for SHA-256 b663cd460147a3e6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 12:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1521674b184f51454a5692ff2833a69 SHA-1: 47826a87b4241faaa52ae86b812d20d781e50d36 SHA-256: b663cd460147a3e6d54b592beb41b8883492c023c2e67d99778b6b06712e4dce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using such sites to distribute malicious content or redirect users. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=categorias+gramaticales+ejercicios+pdf PDF link annotation
    • https://abctranslink.com/ckfinder/userfiles/files/57938899729.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964a9aa196a---7602306427.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16102e16967585---31722618710.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v7sqret0affaqa035789i2rlp4/70552991078.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/dalujenin.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/46825371094.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/24201637700.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/kobaxoxew.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/wulubusolatutukaleg.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021082317285997.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4e6226bf2ba6151b02a4f651b7c60975/bewozawipafemek.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607988b30fa8f---nagipitewimamiv.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/97514885674.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/76558487807.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0911bcada---62329223616.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4567b9954ed79b0df321d660273818fb/70786660013.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c4ae4b86---soxad.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/eae0b764db9f9482e4880b2345399c8c/dopuluvanezi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a728091df---19070381107.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/toketo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcccf6ce76c---22193636419.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/61540044586.pdfIn PDF document text
    • http://dgjst.com/upfile/file/foveviwuxuvukixa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 11020 bytes
SHA-256: 1a029d9f4481b8d972e4b2a42bbe875e7573609224ccabdfb17cde7bed7a005e
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 20276 bytes
SHA-256: 5c76cf36889757a6777d8fba053bc1a3006d9ecdf8412a9672504a5524d69744

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