Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ae6a7733b908df…

MALICIOUS

PDF

70.7 KB Created: 2021-09-02 22:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0299e5fb99d6d3e9d375db6473d5b5f SHA-1: cba3515f2739a08525db6af2e6e43152dc901a53 SHA-256: 83ae6a7733b908dfe84ebeb24d84722a64809a7543c2478255d8de5f8de4f041
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, while the link farm serves to obscure the ultimate destination and potentially spread across multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609175ac8be7a---35546992769.pdf In PDF document text
    • http://nitexprofi.cz/userfiles/file/bosagodewuna.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/3902419784.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/gavirevamepifopugiz.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/vidotakasifugepofevukotiw.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/74a7ea02a9c87c6c98cf4241105686aa/duwoguxevuje.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/xelikal.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/kuvebezuremezajomigivoj.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a8445292e6875ff7df350911f0d393c6/9702323245.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/38465391169.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/vuxobadajikotas.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/25045350431.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/zebogo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62a686b4d---vunigegupakikaxuletera.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/48f2888d90708000b005ac6223817087/nagebarug.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/13859733983.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/99778763885.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608874048d6a4---35759247760.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/95966777688.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609055ea08da0---kiwafopigorodibuke.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/sumoxenirebegaf.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b76c5151bcb391c139fed04690e32ca6/mibipabigu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b35a96c864---62821233888.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103886baffeb---37147643835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=importance+of+qualitative+research+in+education+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_off0000b6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BE 11148 bytes
SHA-256: 0549c9abe4daca7d935dac9de2b46fc61a4035c8d70a86dcb8655c80bc2307ee
font_01_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 14568 bytes
SHA-256: 1844d9c5f2163e244a68b329758c217cd3e8ac15946eec24f2189093852ce230

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