Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6c6a1fd97e9930…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 20:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b2fd81820891b36a5319551d72bf8390 SHA-1: 5cc45a83cb1e0d04787ec4c58ffdb22216bd4538 SHA-256: ef6c6a1fd97e99307e9835cffb56b38949259499fd592e7d0dceb114880aab3d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms pointing to disposable or potentially compromised hosting. The ML classifier strongly indicates maliciousness, and the presence of JavaScript suggests an attempt to execute code or redirect the user. The overall pattern points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mimpiindah88.com/contents/files/xazubesif.pdf In PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/sadiweposugomaxuderetik.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_012451.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/60935169264.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zuzezexidez.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/zolimet.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf369a6d9---44461549749.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/lekagabezumelafe.pdfIn PDF document text
    • https://mahae.hu/files/files/13182247578.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/43284015861.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/rodexonubotegukabo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615674a9e6a6c---paxutuxukewaniwilo.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/4408275146.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16155a907997c4---bikefefinudazuvitizazujos.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/duwudiwor.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614a400a51e95---57516784895.pdfIn PDF document text
    • http://splogservice.ru/content/file/rilogokakovobanulitapap.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/lofufedapabemasitowi.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/70407483722.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/legufi.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/xagalimuzawifubugobeti.pdfIn PDF document text
    • http://esipro.be/userfiles/file/nefejibuxep.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/fejipulodu.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/34844349026.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/85072373718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=all+the+colossusPDF 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_off0000b548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB548 16152 bytes
SHA-256: f7ac8cfae35fb43136957b641bddacdb4b4b1d113ec5b8d24312f220a41f687d
font_01_sfnt_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 9948 bytes
SHA-256: ae6807c67f29732fcdf9477f16ef42c4684ca5b2197342ea1580fff434a66a7c
font_02_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1