Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9de329a5bc94c96…

MALICIOUS

PDF

83.9 KB Created: 2021-09-28 03:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7925d15476695a2a2a4780b12a80cbf SHA-1: 27100c8e4ce400fe68aae3c532bffd5d51955cf3 SHA-256: f9de329a5bc94c966c50703e94e454830a9862dcc1917905895e38139ddda588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on disposable or compromised domains, suggesting a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bangladeshceramicsociety.com/uploads/editor/files/wariduvofi.pdf In PDF document text
    • http://seteo-dechets.com/images/file/veruven.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/6522766257.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/53549489931.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c310caff6e---58329720720.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/60447651800.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/55242489489.pdfIn PDF document text
    • http://airzo.net/userData/board/file/lumetuduxozifutaris.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/33120881131.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-15/20210915190824310319.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/88596162717.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b67f831083---povikov.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/temoridok.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/55912115510.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/567a893d7fb5ed6583c2dde3244e374b/xawazilekuzaxawafunuwufi.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/30743875024.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/nubuv.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2123e51b4f6a0b14df1043eeda20932/52208974987.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/wokudojotivijawizofiditub.pdfIn PDF document text
    • http://danamthanh.vn/userfiles/file/79091966813.pdfIn PDF document text
    • http://ndt-ultratech.com/files/97006683049.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/89036151624.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/wizuderax.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0ccef3e4b---zamexegebato.pdfIn PDF document text
    • http://badgerhillfarm.uk/82075127354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=zablokowany+telefon+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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 17572 bytes
SHA-256: 56b57fb7a79032155e043b64808bd9e5d624c22f283b8151582b56039f4fa3a6
font_02_sfnt_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 10572 bytes
SHA-256: e81b9efde09456bac0f3ae13501cf903d95ffe4c20ea01a3fe92fbc63ec6649b

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