Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c55343d540e672…

MALICIOUS

PDF

74.9 KB Created: 2021-09-27 13:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd7e5c3c37629fafc6167ed53cc5ef54 SHA-1: 2bde6ad8ff9e1bd6198218f146deff76ed599840 SHA-256: e7c55343d540e67290565e144bdd1da93dc2264250e96b4a34b6855e2d2f5522
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and contains no readable text, indicating its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://rotterdampools.com/contents/files/bewozijalutoguwerepipiv.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9e00f446ec674bbed299c61c13649be8/pamugituvikenomugu.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/91291948828.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/texoji.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/32059667153.pdfIn PDF document text
    • https://anaksemut.com/contents/files/71442468236.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210925134343974.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/66163881527.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/81809294201.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/86928645850.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/89a84e61cee56d23a373adce85702c99/zufeketizexugawemefav.pdfIn PDF document text
    • http://wohingltd.com/userfiles/ripuwixigefugit.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/kijugepiwo.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/fojebisamazumometil.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452ab1c638d---65877051518.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/pipurazifabunudero.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c7ee7acd0d4655ea7213bca066a38871/widejoresaxuxa.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631539216.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/54296694725.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4f5299ebf---tikedurefenutejiwu.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/82432228628.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/91887318814.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/bofaguba.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1d6c2fa9d7035a2c8e9da45fb20caf21/43793466535.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/fegugegazutulovefujesebu.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/40494542561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mitos+de+cthulhu+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_off0000b94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94E 20400 bytes
SHA-256: 757abe706a3f3a8b86b723b4ed4c3fbdfa352b670d323af52b9b23fe6d06af56
font_01_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 10444 bytes
SHA-256: 5e4e4917136dbe5e42e52cea60b1d660c2959272c60c8f973396c4c2f9e0d11e

Open this report in the interactive analyzer, or submit your own file for analysis.