Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e7d92da844cfc3…

MALICIOUS

PDF

83.2 KB Created: 2021-08-14 09:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3b10ae7b1184237c0525ba844748a06 SHA-1: 9f8e025b78dfd6911cfae6ce3bf2f605afcb67f0 SHA-256: e3e7d92da844cfc384db843a3b1ae6671e8007f59c83ea525b47385e344bdd38
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/sehjr64fkogfhijg1bdhka2lec/waxujiwusokeguzenadujag.pdf In PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/5897338210.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/jarudisuduririkusuvire.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/87fecade324e8b6dc65ee4e873b9174a/73040207848.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61730d1fb9---20930170847.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/43dc7170e36567613b7d70c851ced95d/wugunosejof.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b39f66a9bc2f1413749ab258f0fd7f2f/dejebelupiterijijafe.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/mezesinedarupuru.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee74de9e61---43948490720.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bec183f1196---10355267743.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc49924d55---powavurusev.pdfIn PDF document text
    • http://runhouchem.com/upload/files/gigukopowabuku.pdfIn PDF document text
    • http://polletnv.be/uploads/files/5730494215.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160788db573782---49740196387.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/damepupunaxulitalan.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/patakofugazasikuzobolag.pdfIn PDF document text
    • https://langumeistras.lt/i/File/26470076342.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mjbe4e3m9fsrkqb9u3r0ru9fn1/99924319441.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8103c693---silisomatofifajepuzised.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/28213198309.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/rovewabadorasobu.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/72109802820.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d19bba34---gowoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=javascript+the+definitive+guide+7th+edition+githubPDF 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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 11200 bytes
SHA-256: b51e77451990ad89809ddaa6e031e8c171d9a5bb169d0a0664be852216313591
font_02_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 16984 bytes
SHA-256: 9ef6df6693c030b329050d5ae2f3b68a05cce9bc45f36598cddf9f39ac857736

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