Malicious PDF — malware analysis report

Static analysis result for SHA-256 9794fc0426ff405e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-02 23:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 587e0205116a86eedbe5e2b0e2d0c1f7 SHA-1: 16ebdcc465ff824e0cbec4a64c4011464d4d4ec2 SHA-256: 9794fc0426ff405e856791bc5513b9d6f4a16dcfab900e4b6b56c8a509130ce9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://maility.pl_adresuserfiles/file/mojunazisamifatisu.pdf In PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/61373653439.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/93145004067.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/piwokizifili.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-14/20210614115936908385.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/jefalub.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071747de456a---fixof.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4532bec66---kojuperux.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/7cc7c3eff01deaff3bc927944bb8070f/44408180286.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/eeacc8d561099c4092e7cdd0d0077dcd/pozamirorokerufemi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dc2e529dd4be50653f9ac8299f3561a/13422732348.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/82670806420.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb4d3f666---jilakexasofidinopaw.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dcfb52ae---livoberopa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42aa746de6---16513010921.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/1rp2mskfe10aqmuvq514eu5495/51198599251.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884df37a41e---vovaxizewividukejox.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/gumobadogunavijafenalomi.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rkagoqbur2jvpjslr6br7g0sce/72550575081.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/55750145296.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/86722612685.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/vogewelawufadede.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/58102908633.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/96920597040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=4x4+rubik%27s+cube+solving+guide+pdfPDF link annotation
    • 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_off0000b7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 11048 bytes
SHA-256: 7654e1351e0ed00b1de820ee98329ca45e0b576943a49a506226c303ace5fefc
font_02_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 14664 bytes
SHA-256: 2eaa200b08dcd5cd4aa9869d0be80ce8f2bf4c673120540a1b3b1fb2a2b180da

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