Malicious PDF — malware analysis report

Static analysis result for SHA-256 900be92ebd6a1e3a…

MALICIOUS

PDF

76.5 KB Created: 2021-06-25 21:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 44a4b9ce362e97be3edc150cf3937919 SHA-1: b7b5ff0d1b34b450eab7705d923a5023d1698f6e SHA-256: 900be92ebd6a1e3ac35bfa5ab403b1178f82565900aa41657d79e72c1a0f3016
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' plugin's upload directory. This structure is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a663c149bd0---84340869763.pdf In PDF document text
    • http://robertoantoniz.com/resources/original/file/83913886038.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad5084e6b---rabevowijezomiwe.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccfe11ffed---didejilivexilawonoveli.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/pudikosegekulewuxudon.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/j98cvgg6o73i88honsc94plcd5/robunufoduweti.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f0e15c039---kasirop.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8cc9dd80b---47405776967.pdfIn PDF document text
    • https://lasanisports.com/files/77569272676.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zopumorebugil.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/47314435908.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/avpg5ighdgnbende6l4v2n78cr/27342142993.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/51b647117be681194d24f18a5dcb790a/rijoxovawezowekojepav.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/783c3409350a298e794b5e9b0f0078f1/wilepixunibopozowirobube.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/811k3cbjmn7bfd3v8f40aujij9/wuvebevabus.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/81781175095.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/musamoderetufi.pdfIn PDF document text
    • https://dm288.com/slicice/file/34685755060.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a44a9e012---fitev.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c8505e79---32557180741.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/acfc01be0a4b90714f85513cd947a864/24788779357.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/39542606379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+lyrics+to+7+years+oldPDF 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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 10492 bytes
SHA-256: 3fdf35e2455fd15c09e81b29926c4e4f951956feffb00a94fba84388d408e03b
font_02_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 17048 bytes
SHA-256: a493453e0a5b26b7c7b7b49509550c77a4248d7fd89254c3c254599a52e9a5bf