Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38ad8252ca01263…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 08:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1774fcf3c7a271c66df435ccf107261d SHA-1: 1d259fd798a9b6b97aaea698faf4b52f8317e210 SHA-256: c38ad8252ca01263442d05d086f38c8f41b79dacdd155b7b0d6f97cc4f5424ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=wild+arms+alter+code+f PDF link annotation
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/32b8c6c419eb4016773a93442524c78d/sovovivadav.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/tljlj4f3k5kpc757pqqnd0m26f/nexezezupefiwosoviroxamaj.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9f89b276---87584706667.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/fubewuwigexamojaje.pdfIn PDF document text
    • http://djapm.com/userfiles/file/62731144911.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/94837710703.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/gifapewazuvuxug.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/benobunora.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b393d18b457---68326947053.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/regisuril.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77b7caf160---28740403320.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/dunitanozaxo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e93b70cda9081bc024b88660b5d511e6/82551489874.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2454e013679c756452627b21e8d08556/davixe.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160815fe261441---rixivaxunozizodakar.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/kuwokojofab.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/makawivonevililefovexox.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ff3c1ab1---78084034927.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/fuwiritogoxosim.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607464c310428---78523223046.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/75595766999.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/92691126413.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/daxuvawetekiwezese.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/34890878612.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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 17332 bytes
SHA-256: 27530d53133aefbd4c2261bb5e2830e2b349ad58379238185f33c846046b1066
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 10524 bytes
SHA-256: cf5dd87ca8547acec6d0478dadc6c0b96c1b8285960e073b01e1bbbb0c4c2e78
font_02_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.