Malicious PDF — malware analysis report

Static analysis result for SHA-256 4612ba24a8dbe7ad…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 06:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16e76a1bc8a08899c5ba469f5aa00a59 SHA-1: 64d33652c7b102edb399f9d89b2d0f0894c2c963 SHA-256: 4612ba24a8dbe7adf91c38f56eea8c0111fdcc807595451c6d7fa1da4a893212
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://halead.com/uploadfile/1631829150.pdf In PDF document text
    • http://dentherapia.hu/files/file/timibuluvunosara.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/tupebirinirov.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/lomajaveronivuvam.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a45e90e1bdbad8a599c8ad7724a30743/85437195055.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/pewafod.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d6582c577bca37dde275e047df59b805/xilezapowaxeso.pdfIn PDF document text
    • http://okun.su/upload/file/19897082768.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/69873354483.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/b1dsdmp28khh9njm65k67b0d76/wisataf.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/mixodejevowixajapikos.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/82900201155.pdfIn PDF document text
    • http://skolky.info/foto/images/file/28965759127.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/zekib.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/28532755039.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109141901148578.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/34423036208.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/84358879567.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/19262309364.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/35682772562.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/wivolubirevolobaji.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373df44c46a---80897414385.pdfIn PDF document text
    • http://marketingnews.fr/images/file/memibibulenumit.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2caf598745cddc80c3daf6ae9923517a/19412539460.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/79609094882.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/72932691639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+emerald+mega+evolution+cheatPDF 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_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 10908 bytes
SHA-256: 57654613870ccf3d186fab03fa14e230e2d7ce949f78ad01c0c28eaa9b016761
font_01_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 19264 bytes
SHA-256: 9dc899ff9966a0df63858e427aa3d62a3ceeedce265bd19a3fddc2065650492a
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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