Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b9b154574682b3…

MALICIOUS

PDF

74.3 KB Created: 2021-06-23 02:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e95973033f095918358d564db81d731c SHA-1: e90a86bf33035d3b24e397b5ed607baf86193dd7 SHA-256: 45b9b154574682b3d34160cf0d49ed8465c3275a6b64b4b877fa3224b55c23d2
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-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.
  • 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://oniceh.ru/uplcv?utm_term=tekken+7+game+download+for+android+mobile+ppsspp PDF link annotation
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fdab43ee82b5816caa755a9dd0def26/38912046707.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7a0c4ec2---68536420126.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/xakasosu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/0ol73oqmc1ak0331ckk7arum35/31051682900.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/625ccb85445df7230ce76183073e52ad/lugokofamarifejudida.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607894946d24b---zewegigiwarifu.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/9048921909.pdfIn PDF document text
    • http://boxethai38.com/upload/file/45536156958.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070231a84375---rijobafonekivosux.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/kbski31i8ma9k7jigtp9452l95/fasofirasipa.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210531_8D6F65E912A29585.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751cff754b0---7930889160.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/30555520962.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077882077c42---70278753348.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/jore21g0fo29q1bma8ibluija4/82492301078.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/81706064274.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/buniviledaxux.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_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 5684 bytes
SHA-256: 1a07a83f30dd9ab89ea7569196a0bc3284c2fb12c8ef26b24d74f962afef23bb
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10596 bytes
SHA-256: 9a50f8a02d32509cd988502eef61a60616acc4802e3ff6bdf87ae5fa14485951