Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e161199703473e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 22:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63a71adcd57582abe197dd3fefe7a73b SHA-1: f59ff0761edf735e7df642eeac37ec1b3597f571 SHA-256: f2e161199703473e607fededcba39c7d93912d428d4ad14a0c52cf6bed1f5f72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d11d6d1b5---57546927904.pdf In PDF document text
    • https://actsonics.com/uploads/files/202109171103224704.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/77052974346.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/talewinuzotemifobewowoteb.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/10551595067.pdfIn PDF document text
    • http://abc-tel.ru/data/File/8541260726.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/fe3e7169939512b00bdf8caee911f42e/55040371853.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795bea554---bezuriruweranive.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/kenonenavifixot.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139af02f3a85---defuzufidojoxivukodujeli.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/datosawibirepipufadiwezer.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/rodemaxanudeji.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/19911884271.pdfIn PDF document text
    • http://princeverma.in/uploads/files/xetedokisumudofeg.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/72509116400.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf10ed74b---62654656435.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109131457413139.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/25219559418.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/19027383247.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/vajaj.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210909102807.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nemapobiragamaxafa.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/38259716986.pdfIn PDF document text
    • http://bociany.sk/media/file/62234175684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=transactional+analysis+in+organisational+behaviour+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 15812 bytes
SHA-256: 950a0721962468ef7b94ad2922a7b5d4d9256481e6581a1006316dca5fbc17e0
font_01_sfnt_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 11284 bytes
SHA-256: e8ee3f6e69ca0aba892f2cb44f1d0923a553f8084e4ccd80cead607776dac650
font_02_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1