Malicious PDF — malware analysis report

Static analysis result for SHA-256 6772786ccf7deeba…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 00:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d31e2462e7cb94d75e4958fdc79fae8a SHA-1: 5163ac58ae9426c555bec9dc503426fb111389ac SHA-256: 6772786ccf7deeba0ca2d47c83083f8a517f1b90989bb51eeea33ffdcac0e9fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting, forming a link farm. These links are likely intended to redirect users to download malicious payloads, as suggested by the 'utm_term=download+gta+liberty+city' parameter in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chorland-dining.com/webroot/editor-uploads/files/26816529530.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/16da4c1483e5363756576a65ad7bb23f/23524962626.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/3402955489.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/wanefisopifudexaxugi.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/vepevexobeza.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/78492156659.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/10615652145.pdfIn PDF document text
    • http://koala-al.com/d/files/64060797193.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/66bd98elo5vivhi69tfuk7fie5/26375387503.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/nowegemuluzabetapunepu.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/lojerelaxomotojazefu.pdfIn PDF document text
    • http://full814.com/upload/files/jatojezewetagelapapebo.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/54883298751.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/47946877312.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/xotonerumekodo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dbff16219025be8dc9f6575f7767d461/sudovigeroduvebej.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/72158533052.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/80303771847.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396ee8c7265---22478486006.pdfIn PDF document text
    • http://onelove.cz/file/44597891042.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/gajuxofureradi.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/wibifaxobubus.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/91424254503.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/657b2611638abff8a7607752c401ed8b/10098449315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+gta+liberty+cityPDF 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_off0000bbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBC 17068 bytes
SHA-256: f3d755d93ba9965149bcdca0f3023cfd0c367033cad70c695d5a07b99da38b2b
font_01_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 10716 bytes
SHA-256: 5ac962a0c974c0fdab42c16cb899861ea63c5e92c675604120f50b538cb15619

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