Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c936e05514af77…

MALICIOUS

PDF

78.8 KB Created: 2021-06-27 07:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f1e716c109f8563dc25b4de69a3bb77 SHA-1: 9537750cb75c222c36d140cf011f543bd183ac7c SHA-256: 40c936e05514af7702ac86981663194f5dd1896612995e8b6b6c04a4c7b58669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The document's structure and the presence of these links strongly suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://smidgel.ru/uplcv?utm_term=walter+reed+ophthalmology PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffdd84b686---21608421300.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/h72l14frfvo6anq0li3v381a41/89475589971.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/kofuzufik.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/22664191915.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/doragomerofililuxafinavan.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/6c9e697c9a4dff37dc916d9c63c8d626/dogosifamamufegi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee93dbfb6d---xojuzixomilukebonusogu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/stn3g9u5lf9on6tc6ugjtkrtnh/lugenikixezogezuvofomib.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb1b68d8b---50969994883.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/resoxadobizowo.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/fevopizuzadod.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/82164580359.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/laderrcbacofjlua2g0j3s8bu0/jujukalibuzirif.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb4f408af---38759725012.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/10341288198.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf02bb971---wagafo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/91323467221.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077baf2a11b2---25752526574.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/82480355157.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/dixijorakorekupijozilofir.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b477a7480f9---rebimemizaxikakim.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/39923419999.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/kopagunopijegit.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_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 10580 bytes
SHA-256: df24f85ed08fa3db4f6627317b4027b95f6eb94e1274064e63e3921b3dc742b3
font_01_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 16820 bytes
SHA-256: e2873337f857119b969a9b8cc8257439271c62f759d9819395eac07dc77acdec
font_02_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1