Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0d68df4e8676ad…

MALICIOUS

PDF

72.4 KB Created: 2021-08-16 02:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c58a661fed7b48c6f9d6f03aaaac4f12 SHA-1: c42ccb796bf9ea4555d31fd07536af432e02d98b SHA-256: ce0d68df4e8676ad88895a1dc61500a1aa064447428455817094ffbb8054ef87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=representing+quadratic+equations+worksheet+answers PDF link annotation
    • http://usaoxin.com/userfiles/2021-5/file/28757194882.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/50391915164.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/60118542264.pdfIn PDF document text
    • https://btegypt.comfile/xunotavumuwori.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1b93g96gm8j8kv2tda3rsh2i01/35039738856.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pefakubuxozuxezidalo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bde0e487b---kokozunowarug.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146de42215---ligig.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210814_081929_4892.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sugovuzinulofus.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/22825006183.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/49905783776.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/49368607427.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28340e14d2---42521654719.pdfIn PDF document text
    • https://maisonforville.be/documents/file/6632730246.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kolejoruzikiled.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/potazasaru.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/verurogatipowipu.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/roritijuremisotufavu.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/xedawezeterililinegodo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb0b090fb---83395842149.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/walutufajilexufaje.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850abcdb53d---6178267706.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/65575374529.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_off0000bb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB32 11216 bytes
SHA-256: 8c7e6cf04d342eae4be1d3f80998f034a1a6395545786dc1933ce35eec2e6ce9
font_01_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 14908 bytes
SHA-256: c408c591615e75acd6270d58c06e8fdda77ad4a79994978106922911135b3e50
font_02_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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