Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24e5bcdc382e1a2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 03:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bf082a1425878c0c675d5365daa8321 SHA-1: cbb99df2e7e451465ae2233ca5739a87b69dc95f SHA-256: c24e5bcdc382e1a25b9ac4c23a93129ea58e58324ae98a744b333633d8c402ac
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress uploads and disposable domains. The ML classifier strongly indicates maliciousness, and the link farm suggests an attempt to redirect the user to a malicious site for further exploitation or payload download. The embedded JavaScript likely facilitates the exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=spare+parts+joshua+davis+pdf PDF link annotation
    • http://qazaqbanki.kz/data/content/files/wuxesizovudatev.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/45459224159.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niwokipuganenaruv.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/101e8bd27935d385206cc0a02e7e163e/86531196445.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee7b04561e---76033439403.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/tirivadu.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/20226423023.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/dipirabateboluva.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/94781612502.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/lusuludez.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/84684322501.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/jifidomogutokutisajar.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/30775122089.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c8a82aab971a4127d07859401d08454d/fekapuwugerinedutulu.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/zimosabavizinarotemotitu.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/ridikulirokexaxorimobor.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/18524197488.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/81875491350.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/52255115244.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/06a748bdef5e4d7ad40dd779b2f672a9/52994576468.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/gejuwezudevasev.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_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 19176 bytes
SHA-256: 1711058a746c4fe0ef065475f97b5d1e52d608068559473ec8ff8393a1476736
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 10816 bytes
SHA-256: f121e2186d2dc0fcf002867ba3546ec2c9ed2e6c1c5312d5dc1db70e84d2f699
font_02_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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