Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f4d6c75bc23874…

MALICIOUS

PDF

88.8 KB Created: 2021-09-02 21:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5695062a195c88c81bc1f93033ca867a SHA-1: 537333b37dcf8a582e279ac13d3ee432830aad12 SHA-256: c3f4d6c75bc2387413df67b1cbc41efd87e07816707e9a565a55b590ec9cd707
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a578223d2f2---surunibegupapedepe.pdf In PDF document text
    • http://wahluenfty.com/userfiles/xuregutesizavugoxexazuxep.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8a18963d---35633287610.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac91b85dcc8---wabamipagiterupager.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a3732b6---dukudalodojigamipesolor.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mebiviz.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/julazubaduvu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f87cd65ac8c---76191129861.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79bbefc7a---suwob.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a058cb4d988---26016090791.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/af8e3317e2727ef2d7022ccb61025717/xilolefawile.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/11gq0t4k6l73kihucajvgseqp4/97882553068.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f73636be6887eeea9a8ae68a5d8e5072/manigezinuduzow.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/1sifv95npvqb6n0vrokgqina23/suvex.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/kunototesusetivewulil.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xokenupifivuv.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/96248721282.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/difonogegogojaluvagalepid.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/25984765342.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef9c008a7f---gizalolepuxufe.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/48386877918.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8ad3bc9c---96200113687.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbe9a491a---niniwugixawanof.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4eb23d77375bb2e277c1f4b40da10349/loxiwodovosetoj.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49dc6db1a---donexosujawobanabiwano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=movie+themes+for+brass+quintet+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 19784 bytes
SHA-256: 4bcf22bdf2857f0602543cebc91967f6f77b7fc1bd08b122acd8a309be99d0bd
font_01_sfnt_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 2380 bytes
SHA-256: 80e149ade39ee9be11c2854c119d0e456fb0f40c1f4e5f3f294b25231f1216c5
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 11164 bytes
SHA-256: 02a53cdbf3fd7fdc7156c17409e35e63e80503f067d6d0004d48225e21fe0750
font_03_sfnt_off00013cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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