Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0448bdeeb53b01a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-04 01:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f762ceef5c4b710797a2842e1482ea76 SHA-1: 661284ac51826b856c42c74b25ddc286ff289904 SHA-256: d0448bdeeb53b01ab0b86315796373416b69ff959dd69f25ba68565aa181b708
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or distribute further malicious content. The presence of multiple PDF-specific heuristics related to URI farms and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=21+day+shred+diet+pdf+free PDF link annotation
    • http://udmvdpo.ru/images/files/5145978769.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/49705024499.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/23677013225.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b687ebcf3e---nafobutafezogodape.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161087ee9de6fd---tugorokelugal.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160739aef6d1c7---20262804859.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c46ce980---dodowawi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/gojivavawizikakinipole.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/59253483988.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf900cc62d9---nulugelabev.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/43599104408.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/dukomogikupuronizasideza.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202151750131704.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16118e4fc083ed---39737027076.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/8dec0e7605cdb3c303b22c7bf82a3cdf/29803161829.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/70217749094.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/56114804896.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/95126878471.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/92944749154.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9bc6991a0---45809231141.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6b026578---vimamolisemiwuwevegeru.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/juwiwago.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c741a02ffb0---36631698765.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/li5gpsp5ev7qsmv2cdo5krb2s0/80477455394.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_off0000b469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 10512 bytes
SHA-256: dbc647704a90a498fbd325d002f4e78d0633fede5f137c54029591c1e293979d
font_02_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 14444 bytes
SHA-256: 3952cf109033b9396b97a34eb7fee81643b38a66d4e9d098b60d3232b1453330

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