Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6013e9807be446…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 21:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05800dcb13b31e441c8d1a130b9492a5 SHA-1: 71cdd144f7062d561245f4242cd8511be316cd42 SHA-256: ee6013e9807be446121ce629ab8ec7184f1dea9d7aea22cdc479f8b4c4908539
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links pointing to compromised CMS uploads and disposable hosting sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://myshiou.com/uploads/files/202109131724562761.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bdba4961---51824883198.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/006492d6c8804fa436af6c62b5918aa3.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/79403392615.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/regomapud.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/fuxigemekibomapute.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c4cbc157b326492b3d3cb75dfab9b51f/pugumevunurobomumimesip.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/84ada3ba65b82ef045e1ebd5ab57b30a/64026080240.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/36515732623.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/mefasatafugenesewo.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/58245099792.pdfIn PDF document text
    • http://geodez.com/pliki/file/70802000864.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210922210905.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/jumoxulotus.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/99424539498.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109072128082723.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/pidog.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tevononadunufajuwev.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/topukagemetibemafutej.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/12343527309.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/vufidusalupuwatuwalituvib.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/nuwatojegufur.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/wenimupaxojalu.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/1460194990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=no+free+robuxPDF 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_off0000b28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 16020 bytes
SHA-256: 0fb040ca9209c481f93c1b99b3e74916e71bd6957168bf6e372e46a668fe3385
font_02_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 9856 bytes
SHA-256: 68ffc96ec45aa37dffdd5d09221adedd06780c012fc9ce6bfaec8c16d8cea8b8

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