Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1e47dde977eb32…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 20:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97dcd31a3bae8dcebe68d631b199c0ad SHA-1: c83a0444a6954fc8270d1584136528dc45754b22 SHA-256: ca1e47dde977eb32c7cd6e31a09d389437ed4acff5edaed8e0bc0b60dad58f4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded links and the nature of the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://fototipia.hu/files/files/nufamuwowebugexusus.pdf In PDF document text
    • https://brillimet.com/uploads/files/202109040936212940.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/pjif9nvrtljtoffanapqrhu634/93774524873.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/mozipakilulo.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/6134651330.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/medaxabusujagavawinulaz.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16134cc5998c45---27217609097.pdfIn PDF document text
    • https://pindimana.in/uploads/file/kosepozokekosug.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4e39de31530a5b7beefd9e0b7fd6602d/64052390921.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/36207330055.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/87115590678.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/99544006385.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///16107612732.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210909_100DF90F03D18205.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/bifatalivurofelidutinirot.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/pubuwomu.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/21970022251.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/fipukopewofora.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/javopodukanemerajopukud.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/88480388948.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/66615539002.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/64265379865.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/76297042449.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/38a272cc7c769b4eaa8d5adf3d0faf66/87472064311.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/65ac9b5e78845cf389cf49021c2e6006/dunojaxokovulede.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/60941797908.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/90254558227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+app+download+iconPDF 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_off0000bf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 10176 bytes
SHA-256: 9830492fa8f495a9d916608cbcc09adb00db20a7d37612d7b6b8a5a9c50eef2a
font_02_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16616 bytes
SHA-256: 38f45c841f389f7a7ee089945ac90a7ff313bd2734a2a9d23c36cfbc855d7d6d

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