Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c75faf6cbb52d5…

MALICIOUS

PDF

121.1 KB Created: 2021-06-24 20:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 71cbd9d144d35d64dcd1a6cc6cef68ca SHA-1: 6edb78155f139a18b9b7f24f8eec12d7561f91e2 SHA-256: e1c75faf6cbb52d57ecd1e98438d9b5718177a4aa4d071c2d65a7da231ffc99c
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=free+download+of+king+james+bible+pdf PDF link annotation
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/97242736781.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cf18f67fedb2daf312b5050379c0dc3f/53086056243.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7e7f0e37387c349ee004a827642b3cce/sufalasijerikuboxuwize.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/fuzujenafabunanig.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/18b5d5ae85d65bc220ea86abb83177b6/90546039642.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/37279665419.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/102290006560aed7cec8c75.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b4088be0---19426287720.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/xedibafo.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210525162191740819.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/63799882530.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d406c7719---6608321593.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b817e8863b6---xopopuma.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eab0a9f680---roxezetimotaxejajexetenad.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/96743816978.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AD4 5688 bytes
SHA-256: b72212190ef35bf4cf1d13cb8a9dcb3622709b5539b3fe4a2d65b42fd7b202ee
font_01_sfnt_off0001ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE36 11736 bytes
SHA-256: edc31b6389dfa3d52037c84997425138532e4a4365a871d3d26e6d95382f7a3b