Malicious PDF — malware analysis report

Static analysis result for SHA-256 7452bb05432f6aa5…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 23:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 002d056257d91b1090b50b8d0ec8548f SHA-1: a532f840983b0e25f0f095aef31fac8ecaf7027e SHA-256: 7452bb05432f6aa56ba2252f9e2a4f16fe6a487cbc6e9909b9e0a8d46ec9b7a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or other disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://yucekalipmakina.com/tsrm1/img/userfiles/file/rujewotate.pdf In PDF document text
    • http://eiak.org/upload/editor/files/lexosovavudipolozevas.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/migosorigeguk.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160beb9f30a4bd---nidozusatarerugamosuzutod.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/11129541631.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/wafalapokiv.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b00c409---jijivesut.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dac21ea4d---loxiketoxozam.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/44500707145.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/dujererojofazelatora.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210901_033137.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/kesibelibixekatosoxe.pdfIn PDF document text
    • http://usmleworkout.com/files/file/81582805888.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/af1ed7c5ed31d150aa06c545cea38081/87057350072.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b21af8a44e7---2189828661.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4df5ad8a0---kuwomesunibiripav.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd7d7ada8---takajemobutexaledozegip.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r99k3hprcfefe40ftj3mt4kbf0/14712865089.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/8943404642.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ab02abd2620f28c0da87d83392448ea3/vovudite.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lunovir.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/23614542114.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5b33cd0e0c15d870c2459977a6f1f021/jabegobiwilubi.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/94642094928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=simple+subject+and+predicate+worksheets+2nd+gradePDF 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_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 17900 bytes
SHA-256: 7fd11d195aded0c81a1cab59bb78f75ff2bb96d93f40446ce28a6542697ec430
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 11704 bytes
SHA-256: 7fbf57e902bc3c92a282725900b08f54e258c9461f8902f5edb5fb7f01eba6af
font_02_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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