Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c692cb60a8257d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-11 19:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d74be315165b3e2fcd08321d75f89a34 SHA-1: 5dbe55e488ac6215bea3cf0f21eba03bdfb8fcf0 SHA-256: 22c692cb60a8257d167c0fabb13bc2ebb6c38a3acc4455129bf4b8ece1a18da8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, often with UTM parameters, suggesting an attempt to manipulate search engine results or distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=%D1%82%D0%B5%D0%BC%D0%B0+%D0%B4%D0%BB%D1%8F+samsung+galaxy PDF link annotation
    • http://mastera-mix.ru/ckfinder/userfiles/files/37091450549.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613443bc48d82---bubanenodexabevo.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/63339096283.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/sesorib.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/wujazapemomufagizexepe.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/darujogelogewixatop.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/kabutosawifepip.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/rojaxepalevokolitalorix.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/05049fc35ddf15e35b289403b7f0c50a/tiwojumagovafuzukixo.pdfIn PDF document text
    • http://hingliltd.com/userfiles/xuwoxezewasideditasaja.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/wafapef.pdfIn PDF document text
    • http://futboltotal.net/images/files/77182148484.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/pijovezamekarovovozel.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mc81vcpr1q15po87c0k9rssgbk/vugirewoxolomisik.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396aa994d02---74619297268.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5mac67pe757v0b8as31d68glc2/mijujexogamiti.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/xuzonubom.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/jelaturon.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/99256967701.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xogojobesijakovamo.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/tiparibuda.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/73285546763.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/83587133265.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_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 24264 bytes
SHA-256: f5d71cdc92d0b7fad65b423cf5418987d41166347e2d595a85ec10e1fe92e4c0
font_01_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 10908 bytes
SHA-256: 98e9d98e117293c652aea3518df2c44d5938a42ca018785e848573ce629eeca8
font_02_sfnt_off00013eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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