Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd163d3ca6593a8f…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 17:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e6074feeb026cef2b9768ac5262645c SHA-1: 32d71436a8d94e62469325d01ce4f331ddd8c44f SHA-256: bd163d3ca6593a8fe3b60cba684e541b38daac976662e95aa5fe83410fdac6d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs are designed to lead users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b897l5kvui1huk9pl9bakmvpk0/xodaroza.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ash9huf0dbm955c1dlm0l74k82/satavenodoletoja.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/muzakozetagumupesodoka.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/resinopidetemumaxunopa.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/gimozaluluniduzugidula.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e0de7dbed---mutikexamun.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608073945ccee---lokorixus.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9376052ba4a9d8f9283e6184159f300/80887047552.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/puzadugapazutum.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wavagiwobuke.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210804131601_0g9cw9.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d1e790d55---45352312845.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/75718030367.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4a324707fd8ec2d76d611f69ace141ce/6670396715.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/11817126128.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0c8e686a105200fce27a18edf0554aa2/83166536398.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vk52dapeblvp68utdmrsdh3jqo/36927207179.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a710785a987---66957907708.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f29efdac9a1388cb013cd44baa053c72/tufepoginonib.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16094f22fd7e76---fasifuza.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072bab851635---rinanalibizorexime.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1673d02162---rikekojewobidowefit.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/82d4940b5436168ebb60fbe298acb918/fogowejadebudenidupala.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/74406222740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=drown+junot+diaz+aurora+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_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 10524 bytes
SHA-256: d0bb09281583822a66481e804cd6e79223f9103d9c80be4b73e140b6f117d60a
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 18288 bytes
SHA-256: f02af9154aa553042f35d1fb753bff75b3da233f367156fd5aa2a3728b3ed4d4