Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead84179598ff438…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 23:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2518c5e13d57c24f213d94e1ccb0e823 SHA-1: dee06be7b1afbc4ec097841b65d7bd5377990195 SHA-256: ead84179598ff438ec85b0b54829f7eff06906bdfad50d58bcc0f978f3121f98
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URLs are indicative of a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f845c5a9e---barijub.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2153fc8e8a---86940162388.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3a7825d217f0803bdfcc5f6df6f1e0df/48554284095.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/aftu66mbstq10gdihfhfl4nfmh/61039551879.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/fawom.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/6929553116.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/69807146656.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tclj5u8ied1usp4lcqd88ig9k4/wepemevejitavepejafo.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/kojunugidesa.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/52046489258.pdfIn PDF document text
    • http://chineseclothingonline.net/File/bewuvaxirog.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/42667853667.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/fapasai6hskhesnprbfc4g878p/86714953441.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fd4ef17e47cc027dab44cca210787d07/tanesebidizegegut.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/84501888342.pdfIn PDF document text
    • http://www.heksan.com.pl/file/79010293828.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f9e2c44b8---gefawazusesasimo.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/20344242014.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b612d92b38dda4224e723b59ad47e85d/25260742801.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/47806574510.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a897361c79f---zalir.pdfIn PDF document text
    • https://ei-hotel.com/free_images/files/98493199171.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/lukupibolebixi.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/32970227464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=maze+runner+order+of+moviesPDF 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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 10592 bytes
SHA-256: 90f670de32753c56441f4452ab20cb576e1642daf78405e76e74a55d9c492c2d
font_01_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 17176 bytes
SHA-256: b7d22800f917dbf4c1f0fdb4960f300d5d88ae0892609c6e8690a7c6e22f3784
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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