Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8ee5b39b1d01d9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 12:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ad35888b7050ef9122d3d561f0756b0 SHA-1: 0725733023ea1186943e27137783cb284e834f0d SHA-256: 3d8ee5b39b1d01d9d2b83dcdce885e52b9531beb596331ad30f4bb5eafb24a79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or malware downloads, attempting to trick users into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://dautuck.com/uploads/userfiles/file/serejokavaw.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139af5cbbdc4---61249693829.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16149f88fdb004---82937028754.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/25115744491.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/63442942807.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/9e3c0243bcf61d7db4c3bd6113695ee8/67886605385.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/66541332507.pdfIn PDF document text
    • http://hkacca.com/userfiles/67556473322.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614c09bd236d2---77675786575.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/bubemem.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/relafeviwopap.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/bulusodisobogubisutomir.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497c4287536---70121413981.pdfIn PDF document text
    • http://btfa.tw/upload/files/39232414596.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/12899956701.pdfIn PDF document text
    • http://nscenter.cn/upload/files/gatula.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f27b5732f---30635835498.pdfIn PDF document text
    • http://myesen.life/userfiles/file/41820217241.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/xagibogeke.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/zulikexoxawawajixu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6kskc23cl9lpchjsuamlske66l/93833653886.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/rugujufevum.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/katuvelologinoxotinir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=disney+magic+mod+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_off0000b003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB003 10820 bytes
SHA-256: a13cb9bc7efd7bfa6c69ed5cf7bd222f2d565e6eedb45a5c004ca59c36fd1da0
font_01_sfnt_off0000c8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BC 15764 bytes
SHA-256: f3f5389a22db9ff507f21cd8a9b3a099a725cd39793a4cf09de9e4778141f207
font_02_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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