Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8ed999292e2e22…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 17:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48f40c6e3545f0b7053d281655ff9140 SHA-1: 6cfd6989811de5318eb7b8181f45a4d8beb5043e SHA-256: ec8ed999292e2e2256ace2ee0a9d96e1c6111259faca08ff5446882d69032d56
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to these external sites. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=infinite+design+tutorial+pdf PDF link annotation
    • http://cdkuysuujk.handysociality.com/upload/files/luwakemodetovuwarexajoka.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/90841501044.pdfIn PDF document text
    • http://elitvorota.ru/f/file/melarabusazix.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cf3d655b1cb1f17d9a8372a5d6d72bfd/25445295159.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/57861f030196d152b211098f24d8b6e1/penenozavimakebeputo.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/7101045148.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/82523739670.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16081c448dd599---pozezalo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4c917d84---sukafupifawiworumun.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/pajuwolisamaronev.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/89635595602.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/62845959115.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161261e9aa0f14---wepeditotubofugeveravizin.pdfIn PDF document text
    • https://x-software.cz/data/file/potixilagula.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/zimujebubasit.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/176a6f3d45d52de27bdd8a831a41acf2/jozixulufugumebakupuziwev.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/86811595576.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160828f58d6231---bijulozerajirikaxobu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/10215340814.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/91015848018.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/94273533746.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160d0594371241---12031539102.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/36416844750.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d5a13edb3bbbf2befedd1aba4082b919/90005273612.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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 10724 bytes
SHA-256: d3271b2dcb7a9d9be9f768b7e7f1bdaace7a3f42f90532330128a7985502fd48
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16960 bytes
SHA-256: e9a4eb0bff3553dbb6fa492e28789f0950ab3bc4dd090f7ef71cc9ea4a559de5
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1