Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c58b83f8d2d2f2…

MALICIOUS

PDF

100.7 KB Created: 2021-08-12 18:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 61dd7158c25a1c5fa2dfd9931749057b SHA-1: cdc06e782c1ec3fba32a9f0518c54114b757589c SHA-256: d7c58b83f8d2d2f26ea4fcaf0dc18056ca4860deda22a676bbcded20d79a2130
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f3ebacf8292927aa476ddb1095c2f0dd/koxidifivavajulo.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac826889e88---62231842867.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dv9b37hlvjcf2togghnk6n1ksf/lazovusefi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/18716172704.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/jisofepilixomejefatapu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zovomoxaxerojajupixeles.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073948a29f48---buruvopejati.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8fa8dd901b961923483ce1a625a48f9f/49249510877.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bc33a8820---67583626621.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/jadafe.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/101cbe03e139a0c8856f6a5d56fe902b/19485592765.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b060fb9338fc4caabfc1a1bfe25a8653/88746692122.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/6983674428.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/12604457845.pdfIn PDF document text
    • http://npas.ru/pic/file/denowuf.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3299ef7c0b8951851cfb5aec6590d824/pozelefepanavoxazuxopej.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/jofojaj.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b800d4a35c7---30210510702.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a76e8f753---kibibepurizuvodixit.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/ledugosimimomezawidenovoz.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/73810663992.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/18046158318.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/xexevigobigolu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/23925d9279c04ee588718412e21d079b/bikanaturodadabej.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083532b6b15d---vobijulevawago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+narnia+symbolizePDF 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_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 17428 bytes
SHA-256: 4b201e8dc496f5f029ebbe8e4538be9fb5f8d7a3e38ede70c1980a880e58ac56
font_01_sfnt_off0001532d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B44 10820 bytes
SHA-256: 0e5206e24c4d26f19ae2e4f312d0578a8fb442afc3544a44181ff4c05bdff0e8