Malicious PDF — malware analysis report

Static analysis result for SHA-256 321a0ea7f6126f96…

MALICIOUS

PDF

95.9 KB Created: 2021-06-25 15:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4956d944b8c8df3225064d3ff592f4d SHA-1: 25da7bbd3d228c3dc8eeeeb6e0ad5c1074cd5cb6 SHA-256: 321a0ea7f6126f9638e21eed6e7b2dfa8c7559c5b2ac9b9a0f13eeed70819ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for users to download further malicious content or visit phishing sites.

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://haps.company/wp-content/plugins/super-forms/uploads/php/files/6p5vv3907epefcp3okoh097240/53557536351.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q4jk36cnvi5kgmm37nsafsaen1/61458770789.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf07b9d7b5---6172385760.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080998cdcb99---roxugiwevodef.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075159e0b891---45036258997.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160857d39061ff---57482854982.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb03c61ef3e---fedidumetopolufaxe.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021621642467337.pdf
    • http://esejsc.com/upload/files/67540867412.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/uliq322dher5qokj0eo39bp4uj/merapolugodaz.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/67ee220912c68ba85a4d89af5f6465d8/koxolexomofo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f982cc121---37562803642.pdf
    • https://dm288.com/slicice/file/jopepaxenuz.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8706ec32e---wosiwopaladenin.pdf
    • http://cn-polylysine.com/d/files/tepupu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=eating+hurts+stomach
    • 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_off00011611.bin
277de8d21521cff0f0f59e3b32b90c9473dcec98311d38c763a7f105c835165b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 10580 bytes
font_01_sfnt_off00012e06.bin
4c75078950c6790236794816f47109c74702176baaacf5f2e90752b17bbc854e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 17296 bytes
font_02_sfnt_off00015b15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B15 16792 bytes

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