Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe69ba7cbf56f72…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 10:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 908673d91583030aff0c1b9e548f90d6 SHA-1: e6f452e5c21aa64fe09aa3850489d582ca40f840 SHA-256: 8fe69ba7cbf56f72f725d7fca315bb36fea138a8109b5363dc770660dc008080
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=3+times+tables+practise+worksheet PDF link annotation
    • https://barcelonacentremedic.cat/files/galeria/files/91029027738.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/21004652946.pdfIn PDF document text
    • http://salkim.com/userfiles/file/sodonix.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/76518497009.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ciinl9ov585qmpu634dmbpl7p4/jobunebar.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6e14cbbd2e829f2c410c87a9ad6143d1/kifigujiva.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c70ba3aaeba---xorusejazuwolam.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/jabuxulegalepakofike.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/99427971510.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/78899053505.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/fulugikawavonaporibo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d12049d8---17554082756.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba054660352---84345733948.pdfIn PDF document text
    • http://planetamama.ru/files/file/nukifil.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61650809440.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/jetubekewuvemuwejuzemew.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/sigidomutirekefawumerexib.pdfIn PDF document text
    • https://capecoralliving.com/media/file/zimivekizegutiforubusulu.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/43756152969.pdfIn PDF document text
    • https://unosms.us/userfiles/file/furuxofi.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gatezekaj.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/deferukufitagigejawepe.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/44974589378.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5465f1149---sipafugufupiki.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/32452821332.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aaaf4eceb---669443058.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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 10928 bytes
SHA-256: 7723b1c94260872465cc9dc7f5d5936ba0b59eec8b94b99748e87fd2b3d39117
font_01_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 16784 bytes
SHA-256: 8e8da477c0f49cececb503b6ac94af6f9912b85b3c3e2310f68d6c865b06b5f1
font_02_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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