Malicious PDF — malware analysis report

Static analysis result for SHA-256 90327d4c07a12df0…

MALICIOUS

PDF

76.8 KB Created: 2021-06-25 20:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a0d1c3bd7ccb58c64fc891a3a3206e2 SHA-1: 21e381e044a6b2f6eae9a892a992a853a0a1ecb6 SHA-256: 90327d4c07a12df034fff84e2d0651950c419de3ff4f9e496cb1f61b8b51b4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/56274276894.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160827cc14289b---64206264502.pdf
    • https://baobihungphu.com/media/ftp/file/18668466626.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/3fd6upj5npi22vj1fep29587a8/mifatawep.pdf
    • https://evpersoneli.net/ev-personeli/file/10432476650.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/hr82hp7qcebqk90cs1mpreohc7/32517748349.pdf
    • http://agendatourvietnam.com/hinhanh/file/13360567917.pdf
    • http://akinmedical.com/uploads/file/lefimozisiwobus.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792cadb8d51---timisewid.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c13b0e5e---1680896935.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb3ea31608---73790194858.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104290945382926.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a45cb8c6f17---sumizituzemonakofav.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cffc5uu07e79cb76uqofmta0f6/32289287978.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acd3663b726---16935317750.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0e0876d12e6bc2cad154995760aee97f/supomerizajodagugudula.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/bf18678cec4d8063cb8fb2b21f67a537/93322897364.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038ef9ab97---basezunulov.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d13d68bc---wetokejanomof.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0s44ahm5m9e98n2c4urj1cjcv1/dumazov.pdf
    • https://deniz-sogutma.org/img/userfiles/file/nufadozezelejonorujetirif.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3aad9c4dc---buponitatowulal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=burn+the+stage+bts+ep+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d1.bin
0e559af821d5e62a4acdcf356260bd21a1e606c119c61adeb0e4df16c552bfc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 16876 bytes
font_01_sfnt_off0000f5bf.bin
98d995e52803742df6d7425704c7309adf5f071e1b711124dfd27dd99a5d326b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10736 bytes
font_02_sfnt_off00010e36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16792 bytes