Malicious PDF — malware analysis report

Static analysis result for SHA-256 210ef7b81f396cd4…

MALICIOUS

PDF

101.3 KB Created: 2021-09-17 21:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 683096b6f1bec0192adb1cf72b6ef243 SHA-1: 2112527277611617fd06cde5314558418c97fa30 SHA-256: 210ef7b81f396cd4ccf36af51c7ac506ec60eebcfce67fe2ee5fb69dc1a1a2c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of JavaScript suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/80226725929.pdf In PDF document text
    • https://limpiezasinasel.com/userfiles/files/14556820527.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/91314988403.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/70065906849.pdfIn PDF document text
    • https://halead.com/uploadfile/1630839130.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131914f0e7ac---tixirazokolavulobikafa.pdfIn PDF document text
    • https://cncunse.com/d/files/7160751199.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/jiloxefem.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/digixugokixi.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408c74f419c---vazelurivigetatunadune.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/74887548218.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/lopojisebipokurepad.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/wipexabusujod.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161426010e8989---21843464461.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/58172478264.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210901093555.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613138c91d6a0---93356235414.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65c98eb11---36403540522.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161412e2b96a7c---pixew.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/76955398434.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/12721509387.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/64041017843.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/97435143631.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/gopuzenadodoraxefovemodo.pdfIn PDF document text
    • http://www.toptehnik.si/images/sajafowobenotizojopagiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=diego+rivera+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_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC4 10324 bytes
SHA-256: 4325d90aa16e4dfbadda47b3c64b0b3fd9936ba2fc793134444ae9a64ea2f70c
font_02_sfnt_off000152f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F0 20604 bytes
SHA-256: 440367dda0fca5a8e0e44adb7cd4969b5fa88bceb16fcc1d0a3aeb9722bad0ec

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