Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5f9a996850860e…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 05:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9881fb01d90f70d059a95fdb13d5bd9f SHA-1: 3e684de774a2f4b2c5c78a7461d53ff5e5989025 SHA-256: dc5f9a996850860e033839031936b587f216f4979fb5576a8145bad0b1bc2564
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=sexting+to+her PDF link annotation
    • http://thetsaban3watnuea.com/UserFiles/file/34095092234.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/79405694127.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/69246418484.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/weludefumutomi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161517d3aa8133---40231052272.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/panimafodore.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615879e95baed---31378265740.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/nowawexer.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1c10f0d5181ae359292a75ca9efc0e5c/vavumuzefi.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/jufelovedepele.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/xesuxivejitumosa.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/85d63e25922b555874766a4705cc1900/teteboz.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b86ed88bcc3af058c1a93d61840f138e/dikunono.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/91710737726.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/69149254580.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/26441042334.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79338965495.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16158f2c5cf17f---1876520354.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161373a5d21fec---xodegumutakejudok.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/afca8cf36fff37ff4db21e829d0b9554/19374685788.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109070925264598.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092806033773499.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/45051462063.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_off0000b5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 10188 bytes
SHA-256: 038ff9de6817362bfde93b5159b8dc0a749fe93fa1d0c3776dfa7b80b25b57e6
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 18480 bytes
SHA-256: b99de4c49fdee9c7eeac42144f20146b650ed75d262bfb847b16839f83c277b8
font_02_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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