Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eaa10c803c2fea9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 12:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb39218a537fb2b05c77499896a3d17f SHA-1: ecc20a97d1b86b3b501f19b35944b46e18803afa SHA-256: 9eaa10c803c2fea908e482e667cf4cb15ddd897eb9d46d61da88c6f0055fb068
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external URLs, many hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect the user to malicious content. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eventclub.pl/userfiles/file/42695069332.pdf In PDF document text
    • http://vetusmeter.com/images/upload/File/9455839288.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/zukibu.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/gubiwutaketixu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ff6e0906a824b363799fcd5b873adf6b/61089761340.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/gigudeluwixifidapefipuru.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/segonorakedavajedavolife.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/19272776695.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c7ecbfea05f39ae2d2cbe2dcb3550272/fikodekumarijununudeze.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/56576156627.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/dasapifelidujukogaxul.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/nerolajapuzatut.pdfIn PDF document text
    • http://goref.ru/files/file/zowobudomazizumozunifovem.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/likenubitalowexaro.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/30439216998.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xupamanavuzuvoxofisov.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/zodomekirunag.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/4847096615.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/71672182972.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/73253915062.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132d236ad42a---26496366604.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/mogenerar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=one+block+minecraft+download+androidPDF 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_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 18200 bytes
SHA-256: fbc0dea1f28c310980be4dab318d346a447dff2204a5399864db13dc94700e23
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 10812 bytes
SHA-256: dff17aacc6921c859bc91ff8ae25e4f0461cf0dd0c42a16f8dcde7db53fe438b
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1