Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4937b9ab56e226f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 13:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94e5ba4a125cb835ae700dfda6b47a69 SHA-1: c20523eac22898e98ebd3bc05b4c8f5fe71f7d54 SHA-256: e4937b9ab56e226f58d7f6f932c3d6d1dfc0c62d7ab77d39813e738aeafe5eb3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://casasholidays.com/scgtest/team-explore/uploads/files/37967783021.pdf In PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/52259467595.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/bozagobizudofonuguxaz.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/70715283765.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3a9f33b52d4b07891eeaa7de4097fa0c/49455094324.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/38601789585.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b251fda6---23771243589.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/joronepesufedizo.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/rejujamilesodip.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/34268310855.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/kulepojo.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/92996335207.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/fumodasad.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f52268a8d91b4814bb2286a8f1c7c79b/lofebawibozosijojez.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1630d0a49---sunukuxodese.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/jeranosalapedamari.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/xubumelufifuzize.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/niguragizabise.pdfIn PDF document text
    • https://pmms-online.com/assets/file/44639923197.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c9d333168dd340ba4fa8c6b9b2b42aa0/jujiselejazototigoxugosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=world+at+arms+downloadPDF 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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 10264 bytes
SHA-256: 9df942514ed7ec30d37e89b4e1f7a643532497bcc45c77bd4c5fe9d8c81db7fd
font_01_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 17640 bytes
SHA-256: 474de75f5a942075bb057e4659799f4aa9306ea7ed25c42e050982f817f8f079
font_02_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1