Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8ced9b9dcad6e7…

MALICIOUS

PDF

88.8 KB Created: 2021-07-23 07:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c100d7c27a376d40a311312746ef84c1 SHA-1: 1a3a3c34a92c9edd52aaecb6cb7d1b5d68e07e0d SHA-256: cf8ced9b9dcad6e7d19a4b81f62e4c67e89440a43d77273e016352db5c2c8aea
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as Pdf.Phishing.Trojan. The numerous external links, many pointing to compromised WordPress sites, suggest a phishing or malware distribution campaign. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://learnersdigest.org/userfiles/file/lesarazosividuwapugurili.pdf In PDF document text
    • http://lnianemarzenie.pl/userfiles/file/65870816599.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4a2dc0243824b0ac8819ae98e6160664/giluna.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/98e1a9074616ed2cb8cfbfed49ce3ef8/wilurodesotirazidinewewej.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8d51e3919f89298d280bc9e36ef03966/bunafuvanujigepa.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a319b9945---roxukadolubor.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607b134b54427---vokanepiwirugopal.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/repofipuru.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/gavakeziparupipaxebuxa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/foa3cd8ubf2ka8jqrjftnjs35f/sopixuvepolagekegigarule.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/juwaw.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/guragi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c873956512---lejaverizotexojati.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8720e40a2---kitozexofiwidudodeleb.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/72e6ea66f82a61ae32d5ed68cb064eb7/82928793843.pdfIn PDF document text
    • https://energooptima.hu/upload/File/jarilop.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/4dce86e73f5c4b56e533deaefffb5b5f/10372794172.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/bapep.pdfIn PDF document text
    • http://protok.pro/upload/files/zajiwamadakapirevuz.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d32da0a51ac0412c366d0d9d352f1c58/7093648989.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qm6f6nd6er7hd4g2oq619svais/69622680799.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/nobefejujoriwe.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/suripekeziwodotofur.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/33549943047.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/mokaxexirojupusamexinapo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1d1c3a33---sobimogulav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=er+words+speech+therapyPDF 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_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 10552 bytes
SHA-256: f6cb5dcd033b48f20393987ed04d536916811c9fff617be41c5fbd5d13cf7302
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16268 bytes
SHA-256: 98f62f4fb2babb0b6240b3c8019def9b766902bb7ad4a1b9926e215354e9fe1c
font_02_sfnt_off00013bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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