Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b7f6dde6ac5484…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 21:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5a733c64e9b6cba636e1ad169dfebf4 SHA-1: 723258d28fb8d044eec6373500ed02844e4e92ca SHA-256: b7b7f6dde6ac5484e8abcac3d2b31fdff0b9f81ff6958879d2b1a6ba93d53243
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly suggests malicious intent, likely to manipulate search engine results or lead users to malicious content. No scripts were extracted, but the extensive URL usage is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=social+studies+grade+10+worksheets PDF link annotation
    • http://otczenacts.com/media/files/12754735298.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b783a3fca8---10598494049.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160828c77650df---nifuvifitosasoxepi.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/49612508777.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/68c2a9b3f88e6f1600bcea0499b4ac6d/ponawo.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/5022329354.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835e300d63---segijalugukofajajejan.pdfIn PDF document text
    • http://roocenter.ru/upload/file/xejimopilavogabuvom.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/41833021271.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/36378404170.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5718668122---punupoz.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959885e7593---tomakekesifowexomurad.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/l3fg3sv37vi7k1llo262jdmal6/83561533061.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/motatolavorikezig.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/54752030965.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/vuvebemutew.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/2215692671.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba86b08a87---mupokijejadan.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8527c7f2214da36be32e56dbb4337438/fosonoziwezarafobab.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744972bba30---musitubevigosubidezazalut.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab7f7d0fa06e0a133098ac7722c5247e/14701263311.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210525190813.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/suxuda.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/77c0823546a08877df9f3cd3fe6fd90d/89254032019.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/96440824912.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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 16860 bytes
SHA-256: f6c514320a00ff4df249d2ac6273b466f3991a1cc1c1fee8f1a4b8bc0de05e04
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 11072 bytes
SHA-256: 99c48cadc5b6bedcd39ab1ac9336fe174bb89164e6c6c80f3f25580688e11c8b
font_02_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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