Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5116a4ec7615e6…

MALICIOUS

PDF

83.9 KB Created: 2021-08-25 17:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e883f9da5161c897a27f836faf10c9f SHA-1: 6d32af2b81b1473b427941627bace663d231fde4 SHA-256: 4e5116a4ec7615e6083a26d97c5f6d3ecf00d1f5ebac66b77b8348ec309659aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to PDF files hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hram-uspeniya.ru/ckfinder/userfiles/files/fulijomizonipuxorawexok.pdf In PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/798250006c599629cb0a9d0615c7e4b3/30943747926.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c7d007484---52866700002.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/15814611945.pdfIn PDF document text
    • https://songhong.info/userfiles/file/zedawomurededeguba.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/be29015a8efb68b8f76a0c3fa08d5327/20072197885.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/talilekexolavoziw.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/redurokoxasovizujelajoga.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3cb6a47c---wujowijozed.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073020c0b906---jezelal.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/235b0876d67a7d22fd2292e48209074f/zekererelizitinojopas.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0672847af---13615544433.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/naxulidotubijemo.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/d32fb68007cd66864265c0cd5c21a197/62828264622.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061809560880554.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/p8ont1kfimjj3n22735cb6gft5/pamifo.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/14507859434.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609837dcc62bc---53429565442.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///xupexotedafobipawinogasop.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/jebexe.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0d5811d1744fa257c0e82a575175d798/mokukusenos.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d4c74a006ee3b56b66f2f64009d051df/7444425482.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abef139bbc0---67779068309.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6f2977f9d6bc61f447e1cdaf4e81feaa/31632526266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=spanish+2+study+guide+for+finalPDF 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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 11188 bytes
SHA-256: e998bc2e42058574b769756667912b77e01cc90c13e3e3ff641c5462c7d6f9b6
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 17544 bytes
SHA-256: c14e6c8c06b0208ddb2c405191ba4ff55daa1bad121852c161f0449776ef2298
font_02_sfnt_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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