Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce85a2330fa4036…

MALICIOUS

PDF

91.3 KB Created: 2021-09-01 20:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26781d1fda65302b8c62f5f395d1f46b SHA-1: 1b5b2f68cb3aea6a9fe8cf53876eb22d5ce3bde2 SHA-256: 5ce85a2330fa403676a62b03bc0aa022482aa119c69197eec628fda4e0c0f45b
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it employs social engineering tactics, instructing the user to disable security software and install a browser extension, likely to facilitate the download and execution of a secondary payload. The document also contains numerous links to external PDF files hosted on various domains, some of which appear to be compromised.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://topenglish.sk/app/webroot/gallery/files/14612038479.pdf In PDF document text
    • http://www.knickmeier.net/images/pageimg/file/11576197166.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/poh91oqs7a3vefr1863363ee2s/falido.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/50c4888cb10fa9f4dd3266991ad9d3da/33288589324.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/92972226386.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/28834869845.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79a54a2189---piporinawob.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/78554311605.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/ad2eed46f1f8b18852919ebe54bf4d3b/givigefojiwetugaso.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/bajuk.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073819d6ae8e---25411610921.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21423410882.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/botivijebosumokofimona.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0a9a42bb9888b5675e05c3c19b2781d4/xugukufaperamuwolaka.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nogisijivusawijagu.pdfIn PDF document text
    • http://nensi.si/upload/file/95704075296.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16095c2802a1b5---72341779293.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2bd14bf25---45193833526.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/98245168361.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/42447908266.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b4c367123e13cdb2d80a7d4aacdf23b8/37012893539.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/36953625032.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094917093bbc---52254384807.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16237746513237.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b88c4fdd84087fabd84fb3657df80cbd/rilawivakojepeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=constant+aw+snap+errorsPDF 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_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 10224 bytes
SHA-256: bedb087b8080fe1071f83410104d204a0e014f7da8e7428fcd3eddadb65a08e8
font_01_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 18372 bytes
SHA-256: 7f3075efa5186a5e93bda32e85f0f472033289b709b15b875d0681ebc2e23899
font_02_sfnt_off000146f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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