Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b3cecc841864c4…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 10:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e71087e2b45218de73ebeac4ebbcc010 SHA-1: d7670309db8599fd224738a3f8cef07fce39ca69 SHA-256: e8b3cecc841864c457fd7c6d9b4d2dcbd81b3c81872123c615b127e1f8c303b7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, directing users to numerous potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://agataklimowska.pl/userfiles/file/91631857260.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161422efa88349---limakukepufesonulugavefu.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/22751126644.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/31597192742.pdfIn PDF document text
    • http://tfforming.ru/d/files/46289870070.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/7758066792.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/27343830422.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451d6b1d8a8---34814792316.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/69671370733.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/af9683c9f55da017f76e27a528ccfae2/koseju.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd9233d6a8---berivafezanizuba.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/5tmaupqtv053iorerjq7boslcg/zitejutewesatig.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9980bf0ac---29927122847.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/xarogebubokoxadiw.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/1612592917.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/miwolodubeneno.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/16376596875.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/fesajadogegojepadofavub.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/55416244030.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/nidepezozumaxopuloguvup.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/25821985229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=modded+dragon+cityPDF 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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 17888 bytes
SHA-256: a55cfcddfd86159328c7c1d2bfd8ab85fc30e330d7fec64b669c5b9a46a93e61
font_01_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 10440 bytes
SHA-256: faaa80891c4ac1ea4f682007a1536a099978b47e5e8db329bf3c785e99beb4c3