Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efc658f248fc254…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 20:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4400020712617fb7e14d39a3eeb94196 SHA-1: e1860867e030593016bd09bbfd3c354c3a401aa9 SHA-256: 3efc658f248fc254e45f417b889cdf2b2ab2668ffb88c088c81f960f8c9769a8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on external websites, some of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f6abb0ce---vinilibomupev.pdf In PDF document text
    • http://tantusmarina.com/UserFiles/file/67888173174.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/92c2d97e27bba3a3237750ca168539c6/rolalo.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/buwet.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/32819828104.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/jegosotafanisupalevuv.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b59e05b9a---fegojusenex.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/sezimakusen.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/59007561196.pdfIn PDF document text
    • https://tuinvandecruys.be/file/minufilavudofa.pdfIn PDF document text
    • http://sentai.cc/data/file/20210903_014458_348.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/bekogow.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a1a2ec9a9---2172703796.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f27a6b7e---runisa.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/zafumakewula.pdfIn PDF document text
    • https://baongochoa.com/upload/file/gibafikipubanivijedu.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/80714517966.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210902file///naganukinobi.pdfIn PDF document text
    • https://clinicscrm.com/img/files/xexiloziditexivazalatoxe.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/74372790370.pdfIn PDF document text
    • https://granitnet.hu/editor_up/zukatoroguvup.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/30150484920.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/gutuwagigutexibudo.pdfIn PDF document text
    • http://adice-area.com/pictures/files/90568768981.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/530927436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+best+free+ad+blocker+for+androidPDF 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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 10800 bytes
SHA-256: 2fff55c071b43747ee2e5b1f9c7b40a9cb8dfbf668338fabc2b4099185694d60
font_01_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 17504 bytes
SHA-256: f5a2f71c9d34031c2bfb4f6b87497b987f5aacbdb1dd2c37c9f6237864f81a1f
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.