Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a4e3cb41fba0fe…

MALICIOUS

PDF

91.4 KB Created: 2021-07-16 23:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ecf0d030bb092de31862f5193d49b5d8 SHA-1: 660df39e305512ebab771ef481d13ca961c0843e SHA-256: 75a4e3cb41fba0fec6c1df0cca29a90c10d6ac21d6ee94e8a8e6a4d8f8f10030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://beautyyaurient.com/editor_upload/file/juwapipubiserobebupadum.pdf In PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/xonanaxebo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160837c88c88c5---waburusatidol.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/dipigilejetusuker.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc121897c90---zazirisiwe.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2761056e---xobup.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8cdf7f07350d892b6423e1ce55ed902a/fumeramidinop.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hq7n51r7vjfseenq1ttrlcf6i0/77837519745.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/86141786567.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kuwifobofajoxoxav.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/luwedoxufuse.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/toded.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609190e3b6c7f---25262120491.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/4502563192.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/49b1e2aa2efdb123d8d40294223520ef/7936453687.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/h9ifjr338q91v3mgn54ufvogne/71956272925.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/26248996867.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e3fcfc0ec3e54f2a54664e97427424f5/dumegivosukurususefo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/684a8ac3d609dc28bba4a825e0d164af/jijosud.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/49647498582.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2f3938c7595ea2b26e35c2cdc4235527/5036463358.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/204d705d8f41fd4b9753ef1196738ccf/80401313851.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/98517259113.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31755647f---vizepar.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/865b78f33ff856664459b004d3cc300b/10623899862.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857384c68a4---mupidagotowotiwoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=traditional+easter+mealPDF 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_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 10372 bytes
SHA-256: aa20f2979286c17c7d63813e22eadd01b43d66f137de0a3b5c25058b3ae55a75
font_01_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 17628 bytes
SHA-256: a14d24605bb7a013dc1a8e18dda1ae867c3d51b8f433484ebe552ff97811113b
font_02_sfnt_off000146b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1