Malicious PDF — malware analysis report

Static analysis result for SHA-256 861c6807f5cbc3c8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 09:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6dfddd5cbeb5567c16a3d7ad0c8f742d SHA-1: dd71a7d283dde58f7e455e9b51b50d8d649a31cc SHA-256: 861c6807f5cbc3c821c79710a9d1f545b0d4c9dd19d713310274a5a1266fc724
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. Several URLs extracted from the document point to PDF files hosted on various domains, suggesting a link farm or distribution mechanism for malicious content. No scripts were extracted from this sample, limiting the ability to determine specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xosobacninh.vn/webroot/img/files/pigaxipazoxapoludixemuman.pdf In PDF document text
    • http://machulski.com/public/file/rejevifugana.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330cbe8f25c---pinadivanebunaj.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109121302087468.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/runixekugimabasuvi.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/zapokamivepezep.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161322f6a7405b---nujigodakabexo.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/tapiburotedexawuvax.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/15972857414.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/97662391891.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/57780246926.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/78747188308.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/rizapupaxe.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/70219176705.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/57306039945.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210913172013.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/70383321790.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210915_140930_130.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/sevolubeje.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/28309722235.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/boxagofusamipajeb.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/75164696628.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qgu5vgv4dtfhu4717as9m9lpso/lusepepinigupi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ivuhk4s3v6eql1ei75214p5561/9701147627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=auto+draw+skribblPDF 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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 10404 bytes
SHA-256: c7c0e6f313e03bae584ffca8b84367a3dffd5f1a1ae95fbc6a383304e8bea18a
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 17568 bytes
SHA-256: fbb391c6c55d7689f18b41961738024f3c79e1e64f4f38b78d09627d70bf535e

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