Malicious PDF — malware analysis report

Static analysis result for SHA-256 04104731bbeb5cdd…

MALICIOUS

PDF

93.9 KB Created: 2021-08-13 19:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: df7c8ed4f9ab2fc4234a5c44e57bc178 SHA-1: 8725eb343796db7a4b8dc19de475971f0a5fa00e SHA-256: 04104731bbeb5cdd7863d34dad4d6ade38e6b8393062c17b4325193c613d444b
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a malicious site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=how+do+i+get+my+private+investigator+license+in+florida PDF link annotation
    • https://cahayamimpi1.com/contents//files/kakedivozonobulinakawez.pdfIn PDF document text
    • http://ebus.cn/up_file/file/94546052045.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf439b130---59045749507.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831654e57f8---69641056356.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9b3d7582---wuxevuwalikise.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/14754788567.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd121ca64---26587544121.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/58b62da60a04db09ed4c8eb24393eb68/34540499518.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/gowavoxigaxitixoz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/igfsh0n4vhbso39ir7aknfh6n2/pofezukonibupo.pdfIn PDF document text
    • https://kristinanamaste.eu/files/6239119034.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/logagijuxuluvurevakuna.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/58f9940b478fd45aec79c42a988970f5/tovowevo.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/nidadusarutafixulin.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/kakaxufubufaziwawisupira.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/25aklam0mgoorcel4d89u3oq8c/lalaf.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/mowiwaxupuzizozoji.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/vexifosenuvipe.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/davipadojoxakelepudemo.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/fifakoxinovifip.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b60b643c---nijibivir.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/87695426514.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_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 17488 bytes
SHA-256: b2d3b32eab206c7ace3ace98a24058943b30db3c2998601278733fe45812170a
font_01_sfnt_off000135ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EF 11220 bytes
SHA-256: f4bf740affbe541101ca4f34b8ff8645f696164a92501ee784c67174c648b146
font_02_sfnt_off0001500c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1