Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeeb1aad46cd6dba…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 08:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 72affda2f4ba7e9b0f052b7db52b9362 SHA-1: 213ddae1b01831462b68dde48e11b50b4bba3b2e SHA-256: eeeb1aad46cd6dbaf5694d4dc1a40529952c69902ac27a80b14b9e03df80e7c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nomylo.ru/uplcv?utm_term=adding+and+subtracting+similar+rational+expressions PDF link annotation
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/72a6888a029cc2acc5e7fda4c5bfb57f/xepituwuputejakixeno.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4svr1b4cjklgiu6cdk4g3udfq4/61214349363.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d50691288---dusetudide.pdfIn PDF document text
    • https://grandegroup.net/files/58052007605.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa2d633e9---fabames.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8f3068ce530d25c47f768b40f537e116/jukirovotuduguvovilega.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/pifuzad.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8kpk5usklhenrsjk98tb1d0hmn/dufanukigawu.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/dagepu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091c05399823---41267545927.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/rikazejobufibo.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/jakevojijosazavak.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/51486054228.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9ii8bo0hm8c902tsaafcf4kv27/wuxobireluxuridefetab.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/fqlc32971grh761uf971m1rk71/navoruramotop.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc3d1423e---xafazaj.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/98945135130.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/734d818e51b85ce08e7a10c23484cd69/nuvukowupufarefefidubeluj.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ph51fjrs18fcgbrpqsdndtj44l/54055502933.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bec69f468---5921503033.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9ed12ba8---bepuxotewifadavowulizor.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/8sho7ulp81stvo5c5n9mgg6pgt/62960216243.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/zemulosuwu.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_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 16780 bytes
SHA-256: 1f6d6e0f6af2d8cba4ffc58d9fcca4f2fd1d7d7c8d46a8c65e62ca2dd32d30e7
font_01_sfnt_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 11180 bytes
SHA-256: 87b85fb0ee06c31deafb46be79958a572fdd2afa3a2451363b3907c96ddbba76
font_02_sfnt_off000135ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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