Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2c99057efe4b0b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 14:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1ef56826999e22bf811775eccc4d8f7 SHA-1: 6b6ddd84b44efd66ba477eb37ae8402ab7493fb5 SHA-256: 6a2c99057efe4b0b296600962948508782def37594da3336837de4169060a8cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://ptk-tent.ru/userfiles/file/39875536269.pdf In PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/94479551962.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/wudokapew.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/xupirix.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/41609185795.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/linizatuwedaza.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/98581530713.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/wagul.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f725d8d0---3246365517.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/lufenuxiwaxadavofatida.pdfIn PDF document text
    • http://matras-devison.com/upload/file/bunaporusukuditab.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/27697398571.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210912175242.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bdbfd1db1041cd637db0489f8aec0782/pisowasevovi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161342eedc37d3---lizadogilavuxe.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/48332762278.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/9026038328.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/zuvebira.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404ea1d47d---nowususozeseluvofik.pdfIn PDF document text
    • http://furniture83.com/upload/files/viwufakukodifivofi.pdfIn PDF document text
    • https://maria-galland.ru/files/file/64565171530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+shut+off+tracking+on+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/54588438443.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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 16596 bytes
SHA-256: f12eedd5a43e121df02b5bba4fef8d21c9b9be63b1f632bc2b403018827d2cab
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 10848 bytes
SHA-256: c8874a9fee8d74314ff7c5c797055bdb88ee88f842df64d20d1db0e31a215d0b
font_02_sfnt_off0001213c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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