Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8975522534ccab…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 00:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d25af50121730a6eae2de6066df037c SHA-1: c07bbeb93de2498e588ab06a08e0f0d5a6f20ed0 SHA-256: ce8975522534ccabfd68a54d8cb60aa24f09f17e74b4136a846b6bb373589b07
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/bisitulot.pdf In PDF document text
    • https://erdemlerkoleji.com/resimler/files/49491661390.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210910_115232_4261.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613834ec5c14a---90117158022.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/tuvotu.pdfIn PDF document text
    • http://webursitet.org/Files/file/risanaxilapivimutigomek.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c97a04593---rawifalixek.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kinq55bag0nrkn8h17rglh4hlc/29769656019.pdfIn PDF document text
    • http://jsdarvin.com/files/91872169596.pdfIn PDF document text
    • http://gzwep.com/img/file/2021915185211.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/6382026194.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/fogikogatowogesug.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kojul.pdfIn PDF document text
    • http://jarosi.hu/files/file/pifoxezepawewojaxujapewum.pdfIn PDF document text
    • http://hongdacable.com/d/files/54260497417.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/3627693360.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/gegipibiralomibaw.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/87513633375.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/35289887500.pdfIn PDF document text
    • http://freetds.net/userfiles/file/dubazivamofikekazewujem.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/20663289990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=woody+harrelson+zombieland+2PDF 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_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 18376 bytes
SHA-256: 41a12897c8afcffa341ce531e4394c4f2f116e6794cf542e03721686d8ea7607
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 10844 bytes
SHA-256: b7d651930921f14005fcb500ecff84e26e3576cb6fd87588f7d138b1e59c2acf
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1