Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fba80f32692576…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 14:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1aef8e91fe1cc742dc1dee05dd86c9a SHA-1: 3ab9c2849226c3d4cd6404b5d83898b8c6ed87fc SHA-256: f6fba80f32692576c7c5af6770b49bdb84eee4f2dd2b21ced8e406b2f8bd97d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristics indicate a link farm designed to redirect users, with one URL specifically referencing a compromised WordPress upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://whatifitspossible.com/ckfinder/userfiles/files/67862786369.pdf In PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/zodidukivowob.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/dizafufarugomibeximawix.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613684841582f---deremeb.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/78835920650.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/jilaru.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/lotikogitefegexotupeji.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/rejanukomuta.pdfIn PDF document text
    • http://chengzechem.com/upload/files/wagazidatutin.pdfIn PDF document text
    • http://bptramptour.pl/files/file/vuselupanumokulukupukobo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135526c2d217---saneruwigob.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/tuwopunolizavebexa.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/7548451023.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613784ebae7ed---nanepadosolanejovi.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/moruxoteronutarezekemet.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210903_044417_132.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/zinavuvojakugo.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/37252882362.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/wuluzilokafegopo.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/81500599601.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/dizexelafikemipaf.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/naxusejesizekig.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/19448763482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=goethe+zertifikat+a2+test+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_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 10756 bytes
SHA-256: f42cf94b5c6e6955bf891fe31b94d895248eeb1d7f8971e49dfc7be59a2e5757
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 20760 bytes
SHA-256: a12cbbead3e2912ef643d3b7ca6f0d60d307add09cdd8e2ab98c5614058d7b05
font_02_sfnt_off00012dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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