Malicious PDF — malware analysis report

Static analysis result for SHA-256 458e996403fe0372…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 16:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdf46f3b0fe35b94369a93f980f19798 SHA-1: d118c9f4e0525052ed41e7d1389816ebd3007971 SHA-256: 458e996403fe0372b7997bab8076af0d3688dbc195e486c79015004f836c375c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=add+and+subtract+fractions+with+unlike+denominators+worksheet+pdf PDF link annotation
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5vvj8daivs0gdkccoi4fiq4jln/punutex.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/76269637ea191d77e7c197dc3cfc98a0/xogezup.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/wanofetumerarixafam.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/viviti.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/pabidarofabekorugakip.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/24838508169.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/55335264094.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ccef12a81---nutusopamebuzinuvu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/fc3bac49369f76944d01997adf442a78/9505236294.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/1899743414.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5403e71c6---95030354853.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf83efb440e---bonifisiwexuwo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93fbba8b81---57049250874.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cc0844b77---vagunasebejifisedejog.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/bewijuvupemak.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/21934060637.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/94737733098.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/omn4d6dotq7udbb31oug4nsumf/85937846146.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/34255163572.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8c2c8bb735f473a86ecc8adaeec3a8cf/mikavakuvarabipakidulile.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/vatiwufodubolare.pdfIn PDF document text
    • http://ux-school.ru/files/files/jimifuwav.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/41559514799.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/gojakopipejozobom.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c2a8320c5---42058039205.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_off0000b95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95C 11284 bytes
SHA-256: 40cd1313cf5b27444a0bcd691c717cd1702819e79bc4d0dbe055c007f1ed62cf
font_01_sfnt_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16972 bytes
SHA-256: b64e2955bdd5650cc555476bef9d5dffe3a204fc31eec27c95cc32ad3188f0c6
font_02_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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