Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b67ab993d0fda3…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 21:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa5062244448f49954ff26c72eea5068 SHA-1: d0b103928cbe8b70d248e53230bfa6f490848bdb SHA-256: d7b67ab993d0fda31298ee781c7f595b8a7073bf6c0da03ca92dc58a2f3c0248
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to external sites, potentially for SEO spam or to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/tosirebusorejobasu.pdf In PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/gobexikonizaxizumi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb41be32eb7---wegatenivuz.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/ziwositusineloxoja.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169022fd80---xekokevagivusubi.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/jilikuxenobunelav.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/41731139645.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/33ea13a5c8d68f75717b9d48a7d8ae07/60899123491.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/99319500752.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8fbcbe78---vajavajiviwi.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16803583778.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/wotakemesew.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f9ebbffbd01fe0e7d41ff3305c7ee41c/wegonenosewafanumezajunub.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wavemetubavekuf.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afebf0bb76d---mazodipobumeviverixo.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/35698479076.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/11652983719.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/25680180132.pdfIn PDF document text
    • http://mlight.cz/archiv/file/datuzavinikij.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/zeluwixosixasatomitobuf.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/65264395962.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/tujupofajodolitaladasexup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sultan+muhammad+al+fateh+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_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 10460 bytes
SHA-256: bf77febb63d61344bafc857226c80806448490e56dd4bd3ad8b609287532b758
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 19816 bytes
SHA-256: e8ead69fa21e9914e6b507bf9ddb53ecf18bbb9cf53bfe48e4a9de67277a6d78
font_02_sfnt_off00013c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1