Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecba6d19233002bb…

MALICIOUS

PDF

85.7 KB Created: 2021-08-31 23:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fe98f5cdd149fd343715cd8b8481917 SHA-1: e283a74223af6260e4dec70b9cbf29486184931e SHA-256: ecba6d19233002bbf6053bf857b298c30c0847fed69cbbd240f08ff1c47d9a43
164 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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The heuristic 'SE_URGENCY_LURE' also suggests a phishing pretext, though the specific content is unreadable due to truncation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=case+questions+and+answers PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d53d11ee---kurizonuzovi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c041d91a93b---guviwiwozogobojozuvi.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/33434129666.pdfIn PDF document text
    • http://klefmarken.se/upload/file/67177121.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/64871945288.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/79862170654.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/kapaxosifopixij.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/revokoxubamatusaralaboko.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/55661238.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/suzukiniveliwaxujuze.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/wubexojolatizobekuzij.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/rubidexemawuzabokuzilanov.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/dufuz.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/junlo6aj75g2tv7c6rksenf584/rukifagimemebumifidutifoj.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/98183863488.pdfIn PDF document text
    • http://koutingchina.com/upload/files/33512221998.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6qe9t0s4m98a0lkqvue8s8rg9b/dimudakanibefabefifix.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4f42ceba04e541838a4f91306614b517/77804583229.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///wunejok.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/290fc92f7afe0447884cc9377a92c4b4/36660797753.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b1102c87a3403430ecd9db0a4e8336a6/79370888549.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7af91b8c3fb323e565874b4d1bf9e372/78286280603.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/41804095023.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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752
font_01_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13124 10556 bytes
SHA-256: bcf1e4f725598909b9b344334f8403b7f2dfa69d19f206845b7ad502701b1114

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