Malicious PDF — malware analysis report

Static analysis result for SHA-256 a283a39096dbd94a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-23 13:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d620703ab9426436fc5d4bc3dd678d0 SHA-1: 7aa126a98b91a5deccfe1e8951769c9362ed8a5e SHA-256: a283a39096dbd94abdccde427c76116ad49c4939055782687b1aa7a59f3f0713
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm on compromised CMS upload storage points towards a distribution or phishing attempt. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://www.slenderclub.cz/ckfinder/userfiles/files/fosefofe.pdf In PDF document text
    • http://ecoaga.com/documentos/file/puwav.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/76558079679.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/843990ebf23a509089dfd68a8499f437/1104552630.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/56415611569.pdfIn PDF document text
    • http://4bx.pl/public/file/jiweronukifaritibedisoso.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/95902172832.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/832a14a0553112633727e71d47d70bda/84129352672.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210923101346_487292857.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/galejadarek.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/pojalanazupazowugot.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/30270537776.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jexajonobadabelij.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/78569111913.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jiwuwewejevileminixobenu.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/najizabetaj.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/12356910219.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/43296829013.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e622c4b461---milopi.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/5073316774.pdfIn PDF document text
    • https://babycloud.ro/app/webroot/files/userfiles/files/62889345443.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/jorakatebul.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/kededajolazoz.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/91494534648.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///29130683175.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/50133543595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+get+to+clipboard+on+your+phonePDF 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_off0000bac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 15400 bytes
SHA-256: b04e3becc3542ea1ffb8035198edcff63dd82e07344d150fbef108e3aff656c6
font_02_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 11056 bytes
SHA-256: 13a8be3444aff1825a079254927bf875e6686ab63e044db8d4eb9f71d8fb1f1d

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