Malicious PDF — malware analysis report

Static analysis result for SHA-256 a358f23f0a811766…

MALICIOUS

PDF

72.1 KB Created: 2021-07-15 11:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d1f3448bc7fb27c7d00d9064f3b4490 SHA-1: 5eed318e263104af1c018fc743a28c292ad86b4e SHA-256: a358f23f0a8117668bc4041754c348e74a18447b7e7d36cad58dc8d589e330b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using PDFs to host a collection of links, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL patterns strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7307

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=how+to+help+an+overwhelmed+friend
    • https://zzhqhi.com/d/files/bozitutikadevalo.pdf
    • https://vildmarksjagt.dk/userfiles/file/2044946501.pdf
    • http://accessiblevehicleservices.com/userfiles/file/10535907877.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825c47c0ddf---kivajogemedikosapavaw.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3f1f28a4c5da3699923b571082681239/19630168381.pdf
    • http://ahkjt.com/upfile/file/62020412083.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ca20b216003737ed3b6eefebc2953730/64627576104.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14c610a2a---mukekutobepuged.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea0383710---xubifu.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1560022d---wunegezoxomo.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ab2afde0---51730517563.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6dff59dec---21539784516.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa67a0e2d---47894231939.pdf
    • http://renovator.cz/files/file/82202855083.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ltmnrmd6vuki9oh9lvonkgrhf2/tibofaxinewanebakuzito.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/h5604so8vrdsufduu8jltpf9qe/49514670245.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c1e11ae2d18ca335e036ee21e11f8c40/51549628474.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f59aea503---tomewemoropisanowosifumo.pdf
    • https://stancijanegrin.com/UserFiles/files/fibeferodobij.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/71394139525.pdf
    • http://amdind.com/userfiles/file/xojepojupi.pdf
    • http://studioriggio.it/userfiles/files/85857714014.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 16792 bytes

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