Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3095a7e50bcfb8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 04:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5010cc2e4a1955f95b70a2ef600afb08 SHA-1: 1a1d1ed812f770b58a2159a89de5f6fc5ecd5317 SHA-256: 3e3095a7e50bcfb82b43decbd0661c4e296745bb9efd09890a147ff2611ee92d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=sentence+variety+worksheet+answers PDF link annotation
    • http://ya-ke.cn/admin/upload/43770299230.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/76321488196.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/9218985070.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/xekaz.pdfIn PDF document text
    • https://strechybenesov.cz/content/86294778925.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/pajonimegumewewape.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/03d5f641045a64b5e1cf4386c7e06fc7/xulefibapakur.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/39235660186.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608726ecd37e8---9842772481.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/152541371.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/7ddddd7c837d0cb853c77b8f6c60a9d5/sudopevipeluriboz.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608961904aa55---35663424471.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/87977709234.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3cgpgmk13o1d5heudhf8lh99k4/xoxoxegasiwexak.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/tonixinovuje.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210525124302.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/784dcbc85b125bc3543db4f9661f9b1b/warirabujufuzoletosob.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/raxebiwolasulezavedego.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/47950512769.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126a5ddc32b8---12720972656.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mv2mcd1sm7ik8hj6kuu3oagg16/pitanovudumeruko.pdfIn PDF document text
    • http://hydrem.ru/images/file/kekovarubinipel.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/13061780627.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_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 10712 bytes
SHA-256: a4aac8312f799395560a1e94298bfef8ad79141c0d81a2b7801706a20687e4a1
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 17076 bytes
SHA-256: d6d9b5f38e34979ee49bbd1d44939c63dd297b87b7fb871f3111644dbc5229f9
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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