Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fdc61c35b0a0b9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 02:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ebf88855aecdc21e722a46afe4313647 SHA-1: c529e24f76ca9ac1390e8c944dfd1e0f003167c3 SHA-256: f0fdc61c35b0a0b9c748666895cf14506d3e315c37f39e7367b7423a9c4e4f35
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puxej.pdf In PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210908_03546B1ED95042CE.pdfIn PDF document text
    • http://schokofontaenen.de/idata/81995100323.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/wixuk.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/19887174446.pdfIn PDF document text
    • https://shevian.com/images/file/75015289961.pdfIn PDF document text
    • https://nistd.in/userfiles/file/sisorufod.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/26812281203.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/delivorawo.pdfIn PDF document text
    • https://actorconseil.com/files/file/96534774074.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381969d6312---45872733048.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/38540277603.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/35594406752.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/55213232726.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de897e6c6e---kenafokaruwapukopumi.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/gijafuwowuratepevujotoki.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/tukopaxemokiw.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/kadetajakon.pdfIn PDF document text
    • https://norservis.com/files/files/pasabajeraba.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/suvinexapadevozixawi.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/25072825531.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ed2453446e8d20f18bd889253639c1ef/48250034376.pdfIn PDF document text
    • http://christopherdallo.com/file/11154450372.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410e99ab555---59434313490.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/meweminapufijexuwuwam.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613828cc38357---mibipul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+studio+connect+usb+devicePDF 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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 17880 bytes
SHA-256: 299000070999abf127339bab263f92f3e824a8b2412f20a54cedaa7b30dfb331
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 10440 bytes
SHA-256: 52f2828ca394356661bcac7f806d9a9cf67609cb54da95ab96db0594ab9d7974

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