Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ab03a879772f30…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 21:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7529288650888c2024e009068647720d SHA-1: 974cfe4365201ec34f24ea51772d3bdc98cf6d8f SHA-256: 61ab03a879772f308fc2424d07bc09a836bc1793b5aaf139f1c8d235777a4ab4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, suggesting it's designed to trick users into downloading a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm on disposable hosting further supports a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e97ffa66fd1ecb34142f4b016d89e68a/20537873004.pdf In PDF document text
    • http://fullerton.kopanramen.com/uploads/files/49975704510.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/34910368533.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/67799935147.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210908212558188619hbk4u7.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/83927040289.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/buwuxesutazojotixejumov.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c28b7a518---85337273026.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/30155778597.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/vubugewinedixemenil.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/gebufuworomi.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/rezukadadudiv.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/23048591710.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/1924990516.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/kigisopezizeweba.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/64848697996.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109040346425602.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/takaz.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/kupumobelebugedilum.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/rugilubi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b20dcb0b4eae1e6ed3db432489217fa9/wavofupimono.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/35188236461.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/57942560649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=batman+telltale+full+unlocked+apkPDF 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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 18976 bytes
SHA-256: 0a8aa2b61711defd2f7e0b095b9bba5bb41491b8a360684237f317da53531a95
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 10668 bytes
SHA-256: 5e5c92d0afc853807b314c7814524cbab01b93f90ad5e9b5dcd06126d4a118a2

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