Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0eb17268c74093d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 08:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d589ae6ce8e4131c1c53ddeddf84153 SHA-1: aebb54201752b84f4319ea623af9726a56bb3bd3 SHA-256: b0eb17268c74093d71089a40c592debae22edf814bc3dc3d470c744264a0f7b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, likely as part of a phishing or malware distribution scheme. The presence of invoice-related language further supports its use as a lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baobihungphu.com/media/ftp/file/wofufexebodakudusogazek.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c334093ca0641e4ec713379362747c90/81631443329.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/17836216287.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/ripavogawetajugonirunaju.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c766192e24fad087683777bc203c07d9/badexosofikitebedopinidex.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/23b38b4c73e083c55d8be56b5658ffa6/75029939142.pdfIn PDF document text
    • https://geniodelweb.com/file/likojamupig.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/boxugiminexojinimodibewaf.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/72924542710.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/31070156745.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/zabikupofufinixamotukalut.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/91789187293.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/mopokatuxajelaxare.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/15390851269.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dface87c66d---37381703006.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b0a03212acf4762c79f1c4f884337f9b/17630427127.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b50acb14b471a4501c686158b171abf0/30882281578.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893cd389bd4---13330374745.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/9658067124.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/forufowi.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/bupopinefemuzenekib.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0q98cc6fll81drtslvf9v1faaq/71669437157.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/16938037023.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f605ba7915b5616fa77704d696aa520f/nogupi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786512660cc---79447702135.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/56228562677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=invoice+form+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_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 17720 bytes
SHA-256: a9d8652145c5ebfdfb9921157b926e103431dd30e14c72c25c3480543ee091a1
font_01_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 10324 bytes
SHA-256: 0eb03342285822781c030ff30dc1aef0a4d2e6e8a58433ee648c125df23a54a9
font_02_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1