Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6eacc50f9c955a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 06:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca8438c80a2d8f0bf6b1600fb6ff15fe SHA-1: af9d7bf26a67efc951b6ab7d70f3c86f885dfb69 SHA-256: 0c6eacc50f9c955a94389daf1f4427c3b2ec108299f1da19bca12d8c169cde8a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lure users to external sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=top+10+root+apps PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5076e9a7---pofolebiximitopawazafaju.pdfIn PDF document text
    • http://medica-brno.com/files/88617450289.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/rulol.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2a9c0cde1f1e381c566bc4315a49301f/35801461177.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/maxufivuvavibaximawove.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f5555695---74393399423.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/gomugumirotukape.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/60640585877.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/580121932.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/87599608074.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/purubujepeludofunog.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/motoxezenodulanem.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/dizimibibojomage.pdfIn PDF document text
    • http://edeins.com/userfiles/file/divipepivaxemuxevoxuxamu.pdfIn PDF document text
    • http://methese.com/upload/files/91985138424.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/7701550259.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/rikatinajafip.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/lexogomuzurozeraretora.pdfIn PDF document text
    • http://vodnik48.ru/content/file/ruvebu.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/jumiji.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f9d72fb22b254754bb8aeffc4d055ba8/zuzufifego.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_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 17412 bytes
SHA-256: 6150a7065e879344f25bd36e3a790f75e0ea279208c32b2e9b91b796117dbb04
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 10008 bytes
SHA-256: f156ef9b023e0d923041ecb40d72ffe879f46bf051e7ff41d7780d1e533a4ae8
font_02_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1