Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece97f0977f371e6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 09:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62d0eae39733715b670cb09cbcef7dd4 SHA-1: f67c1f64bf6a6f41152db3b498fb61b96fdfab4b SHA-256: ece97f0977f371e65e7a225de3e1f60cb5b8c71eea7aa5c2858634262d4e3953
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. These links likely serve as a link farm to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=ejercicios+present+perfect+simple+3+eso+pdf PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129adee44359---foravidadevulavapinogu.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/duperulutizoxugekupe.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107272134103074.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085376decfd5---81270733690.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/66320211935.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/59377607207.pdfIn PDF document text
    • https://soechi.net/userfiles/file/pomizil.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a919ee95961---38538178266.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wogipofudadixo.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/xeretemerozodetuzeva.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/kififefir.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/96398002045.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/19185726486.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4d343b4db---93877150027.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68fa5f595---67754317724.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/q5bp7jdnl731pl1pubs116fafh/72737063966.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070dcf6d70d7---wijenegeketezogopenazifu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/oq8c1iou245u583bp50thaat11/40106714377.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/39251718871.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/lixejunisiji.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/76166488017.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210814_D8786E2189DC448F.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pogadatotaket.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/51954125668.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v1o23borh0auqk69s8k77vk15o/mugupuravefuxomijoz.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_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 10904 bytes
SHA-256: c8604adaed43fbfdc684439247421584b5508f1b523618ef1757612358e7b1ff
font_01_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 18684 bytes
SHA-256: 4f0523bd3f9a2cbaf7b46bc572911bdf964845147e228e12fd1c8edc06c0ecd3

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