Malicious PDF — malware analysis report

Static analysis result for SHA-256 6976ac6caa631a04…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 14:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 202a001970ed930c91aa32b536665387 SHA-1: 0172f31ec3e7dff4d6b258cc10b074cdce1ce9f9 SHA-256: 6976ac6caa631a04b61fc3a50a0003af44f4346c6e255e97f96b0df04aa4705d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. This structure is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://theemasternetworker.com/ckfinder/userfiles/files/tobefapabitawo.pdf In PDF document text
    • http://adice-area.com/pictures/files/36131317204.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0c0f2f98---32955591943.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/17962303640.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ae3fd3f862cc6c39db8b14e8025c88fa/jagepifufunuz.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/17622234082.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/74738468381.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5245cba82---nejegexabonexuz.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/87015372898.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/jejakixapopafujiki.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/kepumozusoxolibebepi.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xiragegusoweponola.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/sevoxedeturuvub.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/e85a9d625f8937b199866cdbeb7d284f/xazuziv.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2bb1ff39---linoxoxafaboxidad.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d81m4dp02okcu4vm198rdp2t8/41260809156.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/japed.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/13441420632.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1a3eb07aa4f3c673623868a58bc9dbec/pavajiwepato.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/gijareronapoviziwaritewus.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073867248d23---digafudekiwofitesa.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/67527471115.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/64982803677.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/4545562172.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1628182464aec708ec4730f22387.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/039873e1cdc85bf0252a2137652a68c7/dumewugivifenapejut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=c+program+for+push+operation+in+stackPDF 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_off0000d0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 11104 bytes
SHA-256: e51c8f01f445f30db9892622f5e10c86d14c9fed3d312cf31c7f2f4a74079ced
font_01_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 17824 bytes
SHA-256: 1ddffe8d27c2d2daea69de4c166a449bc04bb3bfde0c3c70672e5343cf3e62f2
font_02_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1