Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f36e3a1064fc60a…

MALICIOUS

PDF

69.5 KB Created: 2021-06-10 20:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed4e43ddd82de96237ba604264b1bd0a SHA-1: c72e0838305c4aef5be0191c4028dd90a591294a SHA-256: 5f36e3a1064fc60a748632a40755b867857b2d37801860e9d746d52c8cc4ecd9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=two+step+equation+worksheets PDF link annotation
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/1lrifer0hse7uabqbg8scn8jok/magonuzamobifuweme.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b817c0430973a0f5d943d40d20ee13ef/kidurusadaf.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file/%5C/bebilaxajapofezewotero.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1f62072e38606980532e9d795ba5e7e7/35575302639.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mt9s8hk33vsdg22qleu8ml79v0/lezopedudukilanirebugoga.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c142c895880c61fd4f19e5a0e2e527dc/gapurulo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/72134996114.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaceb825cee4987a136f17d37cf07eec/gawerekamimiwudal.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160895c910593e---dufodidaxapajiseve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3e9de460---50466393239.pdfIn PDF document text
    • http://metapolar.hu/tmp/67005084844.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3a3a8611---6447696867.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160875b96510e5---41968600848.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fbot9jfrm7pa0ksqjvif1b1lf0/paribaravomikoxarasuk.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/l8ccsd3rjvoi2fiq2i3cqoh2q5/jirakosowovijitidemisup.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/36db283jbl3b5mgfb3biavdnud/95014942870.pdfIn PDF document text
    • http://atek-ent.com/upload/file/19587889730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 5108 bytes
SHA-256: 4af8d0bc741a9adf23d304da76835b7cac6259366e74610265ce44b8550bcafa
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 10920 bytes
SHA-256: 1ade423d5fe763db6e04eb41aef2a96277ba27bef5d1e41471cca292b5531338

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