Malicious PDF — malware analysis report

Static analysis result for SHA-256 952f9ee037924a92…

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 14:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 470d9f59af5b34c0d85471cb5a3fcb11 SHA-1: e464f9838540b7af675b04e3d9976b93ba0cf9d7 SHA-256: 952f9ee037924a92e4a4b90523bfa4c21fa5383cc7dba60aaf354bee253c2c2a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links point towards it being used to redirect users to malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/nkakqjlofojad0k4pm9kk4gi84/monudumekud.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096f3334a7c1---64340455596.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/9kds0ggo8nolv5rcj5dq0e5644/beweritagaminuvavok.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-8/20210508204924827275.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607897a390d3b---82909174273.pdf
    • http://startmatbaa.com/userfiles/file/53694756296.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5m2uh3o6u71iio7f72rrnum2gg/xinobebe.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c425bb3a8c1---misotonuru.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/revapunefapetatatoravomur.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c41aa055a79---77064648727.pdf
    • https://ecotranslation.ca/upload/editor/file/zupamupatudononuxaku.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094585384be5---fizeradetawozalojon.pdf
    • http://files.ibiza-ferien.de/file/8978751024.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/npg8pc8sgprntrispulo4kkha0/3381287118.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4831e1b5---gidozesiwajikemusiwunewoj.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6bbb1f704---kewudowugowiwafuwovaluzik.pdf
    • https://autosaloncenter.com/uploads/file/jujolufolefukamu.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/derisitinarowo.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/92df394252ae15261696b6f5b8d1d473/zebekulipexezonisil.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ad2euu7405iidishbul27ma035/23732458823.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=informal+email+writing+for+class+8
    • 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_off0000ecb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 16792 bytes
font_01_sfnt_off000104c7.bin
041a1aa6994b675cd3d0a14a1a8d0ebe67656ca8f1f6f22ca0f7112ef8a75476
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 16544 bytes
font_02_sfnt_off00012fa4.bin
e5bff3306f5cb98285bae7823e72623ce98a973114db273236edd3845edecb36
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA4 10924 bytes