Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef59d577343c5fc9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 11:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9497c7c7e31228ffa3cfc939dfaac120 SHA-1: 0beb069deb7ad917f74eed2cd1bcdddd55c3053d SHA-256: ef59d577343c5fc913d3971e86060a61a60fcaab65c7859f9331788b2bca48f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript further supports its use as a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=watch+bollywood+movies+online+mobile PDF link annotation
    • https://printjet.pl/pliki_user/File/94523566068.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/rifilureteb.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6fc2ed966b64ccf04e5dd122102b7c47/robitumifuvil.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/83788912075.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614188a921491---17004484611.pdfIn PDF document text
    • http://scpt.it/userfiles/files/bolawusidigif.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sunapuw.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/xunazusesokudaxirukefazak.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/wijubevojeko.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/siteguse.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/92b93e46116b1d7dcb99e22e75e5e537/79699443444.pdfIn PDF document text
    • http://hocomesun.com/upload/nadasolepusowimogotulap.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/takebegunibikab.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/kokutulofasadasumaxiku.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/66850860818.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/14169864864.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/gexogilanivepi.pdfIn PDF document text
    • https://parkettworld.com/upload/files/popagekatebigasawiron.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/71665086803.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/59510338979.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/jupifowulevazibidupavun.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140abe0bbe85---410281307.pdfIn PDF document text
    • 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_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 10932 bytes
SHA-256: 3944ab8c4d253d513d90c662c194e2b4e66f982ea8c4296babcba04ccc9e1f4d
font_01_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 17464 bytes
SHA-256: 14967694cfe95fcad7a2d5c3e00090f32889af04f875dbbf234420508efd3e36
font_02_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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