Malicious PDF — malware analysis report

Static analysis result for SHA-256 568e39d5e3cc9624…

MALICIOUS

PDF

79.1 KB Created: 2021-07-07 04:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b27a42516184ab247cdc0f807cb587e1 SHA-1: f1df07f421889e0f4ee05a621e0e86cceed55cd2 SHA-256: 568e39d5e3cc962465704c65cd64e6abd226e59f96316fda809b75776ee50459
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/59d648bcb7591537a46d52b9850b3fcf/tibatatijofijarutake.pdf In PDF document text
    • http://limoride.net/gallery/file/zixazovav.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/50v07oeaj9mqftgsr01f867r1s/76767594374.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/83874317806.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210616132200_5escgg.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9668dc376---zemotarew.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/5466tjqfjrmftdle8j1foss23r/58397678350.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/relij.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/17f0adfd38697bfca7347f49577bfa30/39090681259.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/67764652791.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/af87699474a14f68a94101b20f372aa9/femubumogisanis.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6f55b9ac20e95ae4c83dc17e3baed463/61636377727.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160de812302c67---zamududuweraragogebonuna.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0d729f186501e4d21f8fd369735ec92a/lexewerotegidujedelakod.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/29815764774.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072daa1c706f---31390249487.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/rebabibupafomikilugu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/vurenexiwumukapiw.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/pexefupogudab.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/89915452953.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210604112655.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef7288fef---90494111014.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/kuvutufusadidopulivo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085d43be8739---pikoxokiwawitetujizobut.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c750ce3e790---zanalomakudufivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+convert+word+file+to+pdf+in+ms+office+2007PDF 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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 11052 bytes
SHA-256: 08f3daf2ad978454c82a5a544fe7a07f9c120d7fcbcbec6b6c57a3eb45282dc4
font_01_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 16868 bytes
SHA-256: c0bb4778984eccfd1dd8aa7a0191563534fc57a74efa0c0d5ccda0e817c465dd
font_02_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1