Malicious PDF — malware analysis report

Static analysis result for SHA-256 6921d2043148dcf9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 23:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 805d78f8f80c39de5be758d4dc634b63 SHA-1: b88a95914cb4bee7eda042c648ffe115d4af11d3 SHA-256: 6921d2043148dcf97eeb5bfa2e1b62730c0474e75a5f2ab9153652dadb980bb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised websites, suggesting it's designed to lure users into downloading further malicious content or engaging in phishing activities. The presence of embedded JavaScript (T1059.007) and the nature of the links strongly suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://synerhu.ru/uplcv?utm_term=obstacle+is+the+way+free+pdf PDF link annotation
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0189a6552---45994080618.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161321adfcb1df---belofud.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/loreje.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/91970457577.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jepulumulofileronowo.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/sufalomewilinudoveg.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/83654215035.pdfIn PDF document text
    • http://unseretochter.ch/images/file/28433949794.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d1894ad84b40d222b90dfb95a4c8ac2b/pukovefigetakaminoxal.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403bd302166---28215164905.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/rivitabu.pdfIn PDF document text
    • http://handgun.ee/media/file/semozatofimiloro.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/55934177895.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/wivimosutabarawutut.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/53187253628.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/gupifobo.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/rixewalusasopujilena.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/27690992106.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/49180566475.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e56e292893f28c13bb11f0b7985c29fe/12786858505.pdfIn PDF document text
    • http://sissonne.hu/editor_up/13739707330.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/mubakef.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/um0pqufn328ejvjh4s9tr9lv7u/texexigol.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_off0000b71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71D 10860 bytes
SHA-256: 86a7eaedcd0509593f1a32c8e29547dab6fa7c01fdf7c11dfb9b6d6b1d15b117
font_01_sfnt_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 16576 bytes
SHA-256: a9bf457e167160c0e3c63138245f760833136ec9fd14a86c2263bc27f44ab901

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