Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6e1f5309e32069…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 02:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c32183ec67ed98fffe4e821c0ba3bb18 SHA-1: c0a89df263fd22150b19bfbb2093eaf37f1051b1 SHA-256: da6e1f5309e320691deac6f9ba6506fca215923ecf9d5c9b8e558b8fe57e356b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to redirect users to external sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://vatlieubaooncachnhiet.com/userfiles/file/87162471588.pdf In PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/xogakepukiratikubagu.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/sarokokelozok.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099b2858cb---jirus.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/84881392329.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/5961139842.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_838B966DBD6160A9.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/dadajeg.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a59udbcu12bt7a6h3k807mlsj3/90689774449.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/zoriwepefejogiwovez.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/4287105117.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/41044304222.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b39d924ee6---22642086534.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141406a7e500---42294886119.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/vonorun.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/videbefuxuxedijebopu.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/silonisibazarafuxuniji.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/77069349054.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61ea64f86---misutixu.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/jovarim.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ac76d1b70770a04a37b306ce510913ef/nesuvulubinomofokoz.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/20848248128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=emergency+notifications+androidPDF link annotation
    • 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_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 10868 bytes
SHA-256: 17be1f63ec5364d7edb6850299054684abd01ece9c8e78343a986a16f5a324ab
font_02_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 18500 bytes
SHA-256: f4eda87154589b21a066a9f38d236bc343f2c6e62ce6334c518a5791783c43dc

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