Malicious PDF — malware analysis report

Static analysis result for SHA-256 751d897f26cc7cac…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 01:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e0b0bdda71434f5cd40cea2b3f71438 SHA-1: b144a3ce1aa93739474f6fc6175dfbcd0de85b2a SHA-256: 751d897f26cc7cac23c1d31b3ed4c3d770a6e80fcf9e6cf559bc021bdbae3df4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests a link farm designed for SEO manipulation, likely to distribute malware or conduct phishing. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=abc+chemistry+class+11+pdf+free+download PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612192d25bdaa---peleranipuzesuwewinilaxid.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/54402608115.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0346579e---bodapelotidexemuga.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/sawad.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a126400b77c---gojurubijudedebegekapiko.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/1d4728838e8d2b22e3ab5744e2548f02/28843375385.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/sqqcr82gvl81b9mnaup4r9jl2n/damureba.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/82637b53af49ee6a2169ba02aec38066/57471835386.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/43936489204.pdfIn PDF document text
    • http://dgjst.com/upfile/file/wazedujevorune.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210718071946765512992.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/lajit.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/rupewugez.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/48121905285.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2a59cb9498731a92024342d27ef464a1/40580346681.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/kexuxipugevi.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aa2585a28845ac3b0ecd0a5314ea6e5e/sunigulopufotimavedoju.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/fabepotikixasaxaz.pdfIn PDF document text
    • https://shidoremicrosys.com/media/mumimebakebufuxotij.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/dotavemaponilinululido.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c33e820ca---31142233458.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_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 17316 bytes
SHA-256: 4cc9b4d0a717db5273d7c460ce08b54ab2d60b0a40aec762c1496c346be5f360
font_02_sfnt_off0001481e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481E 11260 bytes
SHA-256: 94fea0adb0d365650bb2089fdc9cef0fc64a240edb80f7af70d41feff15810a2

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