Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e00dbe1105e3ddd…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 23:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afbd4771cff76a1d84c2b1134186c6bc SHA-1: d9579a553d7219988bd77b3d6d3040705306ff24 SHA-256: 8e00dbe1105e3ddd51e81415b7184587d8739a287e19752dec287c386c6a426a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://archism.ru/uplcv?utm_term=avengers+film+online PDF link annotation
    • https://wct.goldcrownresort.com/magazine_files/files/kararaduzofalusesedi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/lutaxopazifo.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/91526894888.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130261c0abf8---bapaxiper.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/87718261646.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/93816705775.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/davipobixitubibox.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/24686598089.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/faxijibetujuv.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/gowuwuweketinugu.pdfIn PDF document text
    • https://negaratoto.com/contents/files/gopezidejogofasana.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/54672640487.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090105153673499.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131240ee740c---44648460536.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/meriginuwafepaje.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/fikuroxogakumojedatu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/173ab68646e331c08074c517c6287593/76348953254.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/49219191156.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/95229676779.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/5782363987.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/derimijimedojosuje.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec75f10462---82613309401.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/xobijado.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/beliwixegepowev.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/nokaxunepipokaji.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c652edb6db---mukulenunumowevilurevuf.pdfIn PDF document text
    • 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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 10344 bytes
SHA-256: 9c166e7f52efb86f121d8c6350c68b100fe7fc552c0a873e2c006b5bd4b428ee
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 18340 bytes
SHA-256: 1b578a3ce0b4de105456e407dec70fa890147f8489fd486cd84d13f30e16c1bb
font_02_sfnt_off00012b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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