Malicious PDF — malware analysis report

Static analysis result for SHA-256 455f089c54c204e0…

MALICIOUS

PDF

92.0 KB Created: 2021-09-08 11:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 327f9c81362616226e5653b32cfa1d72 SHA-1: f0ad87ff1a395952543656240792cda190d669d8 SHA-256: 455f089c54c204e0129f1d6ffc794d0b3c3f7de6d29196f0665a0f2f8b3b92fb
236 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including instructions to disable security software and a lure for a password-protected archive. The ML classifier and ClamAV detection strongly suggest malicious content. The embedded URLs, many pointing to compromised CMS uploads, indicate a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091526bd2efe---moralatekefaboke.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/eb0b920aa88a26025ca593bb07598875/natiresi.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/xuporiwotat.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/57830831495.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d119565aaf3110ef03588d518d6bf258/nepan.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3a783af7d46c7d7bb2d056b83e562611/69593182771.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/somebotopubabilokomutovu.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/82884719578.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ebae3d1ad---runagazudopukukupasat.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/zezunodut.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f287dfa71c21e793a6a49aacc7da70ac/dizebesizafi.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/83357930842.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/xibazavi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3129c10d---larafafazizimojuderafeb.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/23601952753.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/bimukanezazelisivutubaj.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/bazerigibedufomo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b40b5c82b38ce2a0ad3c2869ea6aba6f/79362175854.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1629546536SMbQ.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/fugekujulobanirifavebi.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/tivebakojaxasokezadapamo.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/62054788995.pdfIn PDF document text
    • https://masukpt2.com/contents//files/pilisugajibezimi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62414444d---newifebaji.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/19561439919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=openstack+installation+on+centos+7+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_off0001014c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 18136 bytes
SHA-256: 9b74d55dfc15704af413470bee096292f1166af86f1a87588939a073e69b6d92
font_02_sfnt_off00014932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14932 10680 bytes
SHA-256: 1e469545c547da7dc4e739d90ff5d58606865b00e8a7be6947cf6da79e236ff9

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