Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d68dcfb8c0da826…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 08:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51b4409a7ce4519a5b573b49efef90ef SHA-1: 3452c1b7fb651e98548ac6ff4e6c0f16b2ee8bdb SHA-256: 1d68dcfb8c0da826e992b1f61780a065733021c84c3f05c148445b164b1871da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also features a link farm pointing to multiple disposable hosting sites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=download+winning+eleven+game PDF link annotation
    • https://excellencetogether.com/img/files/file/3204380306.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/lubuz.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161493ad736fec---mugufo.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/68822563224.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614e08fee05dc---49856578799.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/rekerotitejibi.pdfIn PDF document text
    • http://cochemical.com/upload/files/51197468052.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a08382fce9cbd2536630fb6524ec4fab/gilelatizowejubanum.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9bc28b90c86590a512b94c89bd11f99c/letetozelemerafosuje.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad8cfe3d92---24018212578.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/piwuvipowaliv.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/34486693786.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/pudenilozuxuxukowopesuke.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/sokojowu.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/13563825997.pdfIn PDF document text
    • https://polaria.cz/images/file/liseluwujisenidida.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021092109562473499.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/86445161867.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/16989665530.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/jelun.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/94797939191.pdfIn PDF document text
    • https://norservis.com/files/files/12840170879.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/wowutetumorexajukolidus.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/sejofutag.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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 15104 bytes
SHA-256: b91ae15982ed37ba404e7aa3219729d2cda0f3a17dd332e230158522a2cd6797
font_01_sfnt_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 10380 bytes
SHA-256: 8d2e6bfa2bc812858b83458abed31f37553c84eb800156d90e6724a875c49c6e
font_02_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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