Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7e5950d3480f39…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 15:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6214c4dac73923b37c2c48b60e1bbb39 SHA-1: 9e3c0134ffa19fd2d559a9fa219a22ee6f0626ef SHA-256: 8a7e5950d3480f395cc214749b6b39d0a7e14243ecde619d4f57bb2fde03a487
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such sites to obscure the ultimate destination, likely a phishing page or a download server for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://signauction.net/userfiles/file/gexovelileg.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098164163a0f---33825891156.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1cfdbae1750b335da22d9318320cd269/jefogulokefoxelibinu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bns4c5qbqn2sunsk8241ptc7v2/midodanopakigod.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/sefudexubimakotibataxawop.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/85d25csjn773svbceck4juqp76/30416775901.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/fexoroxoludajito.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/17053454650.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdc9f341b5---96865680369.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/papuwinirarizomiruribet.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/20647491471.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/17834952520.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/20720641889.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/83112222277.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/tilazinojabejox.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/webufetelel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7712cda1---pifudurisata.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/32470087945.pdfIn PDF document text
    • http://kco.su/userfiles/file/wimujukoporalex.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3c62a987---bivedosepurotaboxa.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160be758c88811---lasinepozexepavotufexiv.pdfIn PDF document text
    • http://millecolori.it/images/file/40528693868.pdfIn PDF document text
    • http://www.toptehnik.si/images/5566493485.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/21581782261.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/00f1db5776f1d41a598d59f6ec783e63/lomoworaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=iba+question+bank+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_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 10772 bytes
SHA-256: d6dc826e8b20d2119fa6fef3ed53238ac525a6fa4c1a0fbb07a33c29f75ac88c
font_02_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 21052 bytes
SHA-256: 6486286614603646002e5d9352ad6562940159f8ffff29892f20c2657e90119a

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