Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bbd2fe9a5e9986…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 15:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ce10735cad178b0f4dc9e40d663d4ab SHA-1: 125f3e4813f79e809f9a9ae93dade17842e37bc1 SHA-256: 93bbd2fe9a5e9986a704f2a31ccc9164577e2e4e8a14383f7abde40d6ab6f9dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=ratio+worksheet+gcse+tes PDF link annotation
    • http://trendybiz.in/usersfiles/file/43229761888.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kupitavagu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/22761450588.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/taguveju.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/df8dbc64bb6d8283005118b3a3da6ef7/10891721355.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/tireriketeg.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/sopokavog.pdfIn PDF document text
    • http://shosholoza.de/file/77493814887.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/domojogajamazus.pdfIn PDF document text
    • http://sciattella.net/images/file/99838131030.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/21519273321.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/tugadibazamimuwewelot.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/23917223885.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/duvuxi.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/buxop.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/nulavira.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/32812197147.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/pogefipaxowe.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116c030b2d---64900393747.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/minub.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/49376112324.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/dozifizokebumu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/54b92f89e6a27eebb876c253bc5afa69/45851495721.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ce4be0d1fa59b6edb3b8432c83072fcc/lulakevabakok.pdfIn PDF document text
    • 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_off0000c659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 17864 bytes
SHA-256: cfc2d2d1f769b1aca3a071f15b1f5fe230187ce3747fe0c63ba6e5663f2c00f4
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10580 bytes
SHA-256: f6add51785365fd8eb396c4db2fc3fbed9ae75d26226d6423c126c549b3763e0

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