Malicious PDF — malware analysis report

Static analysis result for SHA-256 f357f8fd1d7fef3d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 10:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d9b62170439944ffd603d69cc7b0525 SHA-1: 298b7cf5c8c53aa22ff990c9aec523d919385f7f SHA-256: f357f8fd1d7fef3d796d222d4276bd0b1d5681ccdaccf191aad59ae69f5b7a17
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple external links indicate an attempt to lead the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=codigo+etica+medica+pdf PDF link annotation
    • https://airbays.com/userfiles/file/kijirawapigujugubenigos.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2044d2f7ec---23397877498.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c7ccebc7d---25122287775.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607347305aeaf---siwesolepud.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/zulavonalulezadibe.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/22982330361.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/51471628854.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/4513322287.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/9340092654.pdfIn PDF document text
    • https://ghnservizi.com/file/98975319720.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/03aff98c6365d3534e5346230aa5c266/lotefoginidosalerapi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c563d31cf---28972117744.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fa54c54808c---soninebiloxafexurakuge.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a4f4aaa7---72349072908.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210902_996D620A82DE7AA7.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2a2f8c68d---17112095422.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4321fa10ae298cdb6a794a95d93367e9/80737722972.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/kebarekovelefi.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/11716073416.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/xabazolofifiwarevasajub.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/enk2q8bpe9h6nbqf9uiobt9d83/81351948811.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/wevosuzibilevunulizagula.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vozifegajuwufidoluselutuk.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d33a8645ab91ca37a2803b1630539534/23224464225.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_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10576 bytes
SHA-256: a696bae959d3e1c3c83cc03cd6ed071ec7338a803868995fd562f3f10dc4deb9
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 18436 bytes
SHA-256: f59eac245d008c3bd7bd1f5d364f7144b42a505addc0d19ecca71a62260e3830
font_02_sfnt_off00013452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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