Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90859542a2953d9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 17:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5384d6712e2880e38ed4f1e95bc36ae SHA-1: d3e8e42ec4b226b36ab85b6ba610cb01387caa06 SHA-256: d90859542a2953d9435a5d05ed8ea5e844bad67f52785442e1797c2bbdfaeed0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into believing it is an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bertrandetgastineaudesigners.fr/userfiles/file/74108639318.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8be50af1033895a84fd13e381a647cd9/riwenenulikowikufezave.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/afa22d6e006f3dac671ffb3b76dd406e/mugakuseluberazuwavar.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607845b17cad5---33788747837.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6d5b4fc8369532219f8f151c29484102/57416126905.pdfIn PDF document text
    • http://offerparts.com/upload/files/ximomoxavokepamuxevijekag.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f295626d---96743255240.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/59423662402.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/susufotiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609028c398594---sodamofoburodo.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/denote.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/wanam.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/74caee6c30ae1c75fbcc4558fc269e3e/wejan.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2807d5385ed88d16ea419609df5bffb5/bagikixudajezadajo.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/db57a938cea82d49d14ed9f3e2de8657/30638737280.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/tatimipixobi.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/59548179973.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce3f67aef---vexepexadixadibemikes.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/40fc3899e4ac5d8c8f5aeb8731b8e219/wemewamixuro.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/fukusoluvi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a2546602761e28f78e84cf0c9a0ad959/vetofavidase.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/e812e80fbf4b34b03442d24ad6a9bbde/zutigapimib.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/9537cd55c0186bcd700155111c5e4044/70553911464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=money+lenders+law+of+lagos+state+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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 17560 bytes
SHA-256: ab811b8e3a1ad37b3d046d86b0f90f8e4528558b1bc2bbc4cff860c3f9627e8d
font_01_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 10772 bytes
SHA-256: c6a0d10a8a5a4fb6cbb24118d57b21b4c90a04453dc6a7eacbd8f81d1395cf31
font_02_sfnt_off00012d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1