Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae32a4683126490b…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 17:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 395733c3f92080421c4b8c17e7df19e0 SHA-1: 392d7ce35066ada0d301500584d6b9f8c253fcff SHA-256: ae32a4683126490bcc178fb17fe627b52bba6c040b2775bec75ea8be0405d325
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute further malware. The presence of multiple external URIs and a link farm heuristic indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://drafthe.ru/uplcv?utm_term=how+to+allow+apk+install+android PDF link annotation
    • http://htbestcomputer.com/media/ftp/file/2444998171.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/jaxutirogoselexu.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/kanafobosipibogip.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130e846601d6---69355412197.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/jimof.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/vavelezenipoguvamunufi.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/97835184806.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b9585fcd---wavudazovol.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c4ae4593c6f44f15bb276068e4c2e994/vepojasomefun.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/57530074104.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/19057804200.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/74481073159.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/71123746657.pdfIn PDF document text
    • http://wernitznigg.at/files/41055483434.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/16487332874.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/dizukajapegusi.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/24088291316.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/44379832398.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/devemarepogutivasez.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/nekivadamekak.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/24036385035.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-25-05-04-24-85.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_off0000af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 16804 bytes
SHA-256: d30a9fc88eec62c638bfc33b97395d360b9afa714b246439afbd176f92c9d7c6
font_01_sfnt_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 10420 bytes
SHA-256: 0c2f4a195bf66bddcbc428c532f1ae4b2a9a4ef85915b6dc366476b7bcfe0a66
font_02_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1