Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c22851e507c1fd…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 19:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 936a0a550b89b63833f113bfc7830b45 SHA-1: 0d87626414805b1d4d0a156075945bf134abaa60 SHA-256: e3c22851e507c1fd5bdb91d1b548b1a5ad7fb281883c3e5495c597264d62d8cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of a link farm pointing to compromised WordPress uploads and other domains suggests an attempt to redirect users to malicious or phishing sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://f1-rennsimulatoren.de/userfiles/file/luxapilarelu.pdf In PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/18183923078.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c289cc382---gimifekef.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/28539036142.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/bodaf.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/49143508367.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/62292620904.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/wadafugixod.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/49311581589.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/mupuzuvivisev.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cjptjlf9eblgikkb5v2uss3ig5/7919089856.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b97e766a99---57155837124.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/weliz.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/taxujogewapoxuvuje.pdfIn PDF document text
    • http://parateam.cz/file/bibifob.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xiwazadelipuki.pdfIn PDF document text
    • http://duef.ru/public/file/kojulatanasuwo.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/zanov.pdfIn PDF document text
    • http://muszempilla.com/files/file/61008742633.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/xagusuvodaju.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/zixodogekixirid.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/25559153358.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e45679dbc---98670010517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ielts+speaking+vocabulary+band+7+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_off0000b1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 15428 bytes
SHA-256: 91504e844613dd1e0a736137ae2582049d56d3e40de1899ef5c69001fe79dc5d
font_01_sfnt_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 11308 bytes
SHA-256: e0e9e12e4adf5dbd14b04e43c485b460a65180dff7540ec12936c4a0983d5348

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