Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecd67392f9798f2…

MALICIOUS

PDF

84.1 KB Created: 2021-10-07 22:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68d2c3a8d29767e53c1fc00e3bc95ba1 SHA-1: a4f3aef2f0c8462717d2aba04e23016bedf298b1 SHA-256: 2ecd67392f9798f2d4325b55db10c4a70e076771723c2af40bbedb1d4ad1b011
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://texasbordervolunteers.org/userfiles/file/viganubozemelasa.pdf In PDF document text
    • http://chanhungcorp.com/images/uploads/files/bofoso.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xubosigedasun.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/7659853805.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/87139021195.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/97674019076.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/59115672214.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912062814.pdfIn PDF document text
    • http://4bx.pl/public/file/62781734581.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/40821697758.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/27478512323.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148d78aa5317---xisujozoxejovunesegisotab.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161527f32ac712---10260466160.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/7224033346.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16309164814064.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/pogisebajokof.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/84289518770.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/46979954262.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253d791c44---kodurimegimovajukusatita.pdfIn PDF document text
    • https://mkontroll.hu/File/taxidifofumubosewon.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/294025791.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/59241337203.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/26581432258.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/96534755144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=html5+templates+2020+freePDF 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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 16768 bytes
SHA-256: bcd0da96e12b0f8dacf7781a6c79915b8e1853bc12e4d9a7fc5ae3b9642ce6cf
font_01_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 10568 bytes
SHA-256: 59e45e2efcb09d6911255823d57ed4056fc52bcc6878f497819a748ef1808125

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