Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e42d68f3067fa5e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 10:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ad210094bf46aa036bab3b1119ed635 SHA-1: aacd6be5e36418c78bea8e65a6fb62eaa01929b1 SHA-256: 9e42d68f3067fa5e249cd3731e80e5bdab8b71f9b02241ec58eaf9eb1b8d5cb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://kolkatanagariksammelan.org/ckfinder/userfiles/files/64970441193.pdf In PDF document text
    • http://radio6deenero.com/uploaded/files/28802328991.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/32479887004.pdfIn PDF document text
    • http://d-innovation.com/upload/files/wazekozizigovefogakiv.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/nanabikozesosiniwuwigara.pdfIn PDF document text
    • http://sushibelovo.ru/files/45514119257.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/11666796975.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/virixusegeribewewuf.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/97190280432.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614cee674b9da---20153207899.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/92153423407.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5ddce8f1---41956442273.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a0f6aa85015afcd6a8d822484dae08e0/73035696197.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/96155666397.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/3781449499.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135492e6312b---63816101561.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/38071830546.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/zigepovuzetoregipagime.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/vafupojizexodasegune.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/xunojogexajugowewebaxejoj.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/21498822690.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/lafilut.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/venawefifim.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s2f15uvhmh4g946l22oqr3ds52/texugot.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/foralamibujajunurisupa.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tisomotibivagaxewikosofir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=root+apk+editorPDF 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_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 18228 bytes
SHA-256: ba199b7ffd7bb9743ff86e52866232ce8ff66f7c1e2d831124fe0b2aed445dfd
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10204 bytes
SHA-256: 50e893e70d71143b30fc95e16ce97c3a84d289f628e6643b4a42de9a4a3a6e8d
font_02_sfnt_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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