Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e96f5f6a5fe473a…

MALICIOUS

PDF

113.7 KB Created: 2021-06-27 20:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77aa1dd933c2932fa01a2d4f1f42f95c SHA-1: 4ddf8f7a10fd939858242c3a3f3ed9a03837fe72 SHA-256: 4e96f5f6a5fe473afffff10e8c995bb0fd6f7c8c67c8e09377b4407a9a5e6bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the heuristic firings related to link farms strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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://catamma.ru/uplcv?utm_term=prolong+the+time
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160942bcadc73e---44485257849.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ba947feb---38315901675.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708570af631---78968743926.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c5da8c2a46da0768674f257c3f754df0/33894453061.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/vepibejidinapoxu.pdf
    • http://constantemails.com/userfiles/file/1623080619zokag.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730efe4601a---62360847174.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080065568bf9---matuwomagep.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bec5a9b09a2---nasevisipebejiniso.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/noferifaliri.pdf
    • http://vogiantinhmach.com/media/ftp/file/43894475211.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/8t4h761haj0do6nr0h08svq07h/kumupetefageseparenipejov.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9a6bepr7it3ghs8o8nspqhp0q9/34318884280.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9p3t6ns73hrdn29crgge2np6bk/duvuxulutunuz.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c8ddd7d9a9ed95d816196473365db1ae/24580486703.pdf
    • http://fujavietnam.com/images/Download/fenufi.pdf
    • http://modnyi-buket.ru/uploads/files/88580060640.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/55a2bd1387c65ea364d5716a8ee6c286/79543822272.pdf
    • https://peilimineko.com/userfiles/file/refijowixamodogikidekoba.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-17/20210617011142167397.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdf659d61---3721442988.pdf
    • http://staresecurity.com/userfiles/file/78854109214.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2b1abde8---sapuzejexedepixi.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608600c6ed799---45347213630.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 16792 bytes
font_01_sfnt_off00012526.bin
7f6d5e955f225e5cca9cefbb35722019189c9c7292fd9e23f920cfca201fccfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 21104 bytes
font_02_sfnt_off00014a7c.bin
fd7f3cd8793bcdf5d1a6ab1d7762d067eea6c28d6874a1ebdeb6a4913866f1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7C 28544 bytes
font_03_sfnt_off00018f1a.bin
2d108f5cf1fb162de9e008df1a932e4f262f10e8794493b669742152d2fb924b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18F1A 10224 bytes
font_04_sfnt_off0001a5bd.bin
61a7c7cfde11ea57683caddbc0b2461b31417ad333064f452862955306ace8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5BD 5396 bytes

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