Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12187f4b68c9344…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 01:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c3db526273970a0353a16615deb720f SHA-1: c7cbed86c2224646ff6c871737b11e2f7483c7ea SHA-256: f12187f4b68c9344cb4707e90828fb3cceaeead7c8f3a4a70d6cbe9f846e6da7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's purpose is to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=transfer+files+between+ipad+and+android PDF link annotation
    • https://limpiezasinasel.com/userfiles/files/39072854458.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613517e15aacb---wetaxusimuwotabotug.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/23383524732.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/14058668054.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/deguxum.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/51650627032.pdfIn PDF document text
    • http://reopen911.info/media/file/66447822501.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/riwidobaxoderi.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/35402598625.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/72854398028.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/boxopav.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4230a0578---62230414470.pdfIn PDF document text
    • https://pmms-online.com/assets/file/xefegodaniza.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/wewirifupozojonunanilemi.pdfIn PDF document text
    • http://rrarental.org/upload/file/pazofodaxidatudewugifat.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/sodozuj.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613548e2d9f1d---kadoxigawasiwomifiwab.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h3fgba00js6ne2918ehs8ko4nn/bejopumapatakasafita.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/ralamulemasej.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139630072a64---pazanixesazo.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/muwomibusopexalomutar.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_off0000b70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70A 10680 bytes
SHA-256: bc9804b34f6008c5b8740350474a01e951812bb423000eb39b9b7ac897ed259d
font_01_sfnt_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 18204 bytes
SHA-256: d39f67f4b66f568ddf94f154a3af6a0a6e5bcf8bbe785ebc2f5fc39d5d49e1e4
font_02_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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