Malicious PDF — malware analysis report

Static analysis result for SHA-256 a724cfd509d199ef…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 00:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fceb762170334db97d4def54f2716d8d SHA-1: 4b37f62f945cf5304d64b662bc1bfa05a522a427 SHA-256: a724cfd509d199effa8b67139a00d62946534288d950c964be4b9c722480d5d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. No scripts were extracted, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point to a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=hp+wireless+mouse+z3700+manual PDF link annotation
    • https://cihangirhotel.com/upload/ckfinder/files/62612251606.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/gemofaxaperekibigevuje.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/7cde4318f1f9cd8a373b16d38a6ecf7a/4406595559.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df4fda0b4---mujujeresidipawuvagino.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/33141186c037307da0766e5d9d26a6ff/4234430299.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/18037328274.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b583b9374---vezuvofexe.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/fiwepabog.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/xaborib.pdfIn PDF document text
    • https://atlantidegattico.it/file/73419887688.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7045603b1c---xulamowijakaw.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d90897d5cac---99843085374.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/n80im5e95v1rd85l2ic2j4pbgf/gusonadejaxo.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/dovodekijobegosi.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/kenevomofaragarobova.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866d18cb9ea---50019961260.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/64055487253.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf7bebf87---17368784831.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/dexipasejufawu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e76d988f787---xojemunu.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fd0ea90abc06c1074907e9956adc7b91/66687456241.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f946943b581---xoziwoli.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/20697274237.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/78851058784.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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 10896 bytes
SHA-256: 7cea731142a04e6dff0a20b98c4343910cacce784dd10bf0e7f7c9a01ea09dc8
font_02_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 20768 bytes
SHA-256: 062219f7ff96c223a64f0843779ab1f63c48e5435ade9533d6a54c9f18a8bcec

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