Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e18deaaab09340…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 14:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d8ed6d2a5245f681b5e8cb3f62e1ebe SHA-1: 79d058abd617faebe7b8bf12f46e7eb5485d80b1 SHA-256: 53e18deaaab09340021da831986340d3bd5c88b72f7488da36a5355ae0e267f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://autotrans911.com/thread/admin/uploads/file/76935049585.pdf In PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/2563014097.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078517f03948---nipiwirulozo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/96320180310.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wuximoratajefirar.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/43609364594.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/41715245767.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/lifozaxikubojulezuvog.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/59293924384.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04a69dcb80dc368f8f0c4fda715723a8/40521728942.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/73456646867.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed425cd61d6---35678702985.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/26175814790.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce935f0d30e---59133726184.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084de031b78b---jibatuxedidowovalujamuxox.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160de0224805fc---13468332216.pdfIn PDF document text
    • http://newmob.it/userfiles/files/motebitojivamizijes.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/82479215142.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1627094846.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/96854112775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=electronic+devices+and+circuits+mcqs+pdfPDF 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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 11076 bytes
SHA-256: d7dd83214712e67f7782bcf4c5b5dd96acecd944d841f729240d98572a24b0de
font_02_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 17212 bytes
SHA-256: f3d3487a0032dca75662067095352d32ec5d8b8c72f0e7f5b31f6ffd13907e41