Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf48e1a5a5732da1…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 11:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a24a8738f7a944899a5178b64e7e271f SHA-1: ad64e510639ec0ee5139e46050ba9da99bafba51 SHA-256: bf48e1a5a5732da12bbbce00863307e18573c90bdf8361aeb76872aa17704e6b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9d0b7066ae7c617c2d0e50645da19dc2/26682917199.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b95a9e2f19ed48e21a1e31d478dd820b/nesijutapelirur.pdfIn PDF document text
    • http://orem.mn/uploads/files/fadadaxudat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9efc1ecdcd---47302058965.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/651a02d9abfde2c7ae7150d7b29da26a/vutimolixoboro.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/8d84a58576388a82a69b71691961207f/1518675720.pdfIn PDF document text
    • http://ridendo.cz/files/file/bemib.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/10832420299.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/folovebosomi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a831a32fb0f---xikonafujuvolagezirusomu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d4497ef4---75512513755.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/tetomopabodona.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/35638162087.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c4eb3e47---99944788141.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026ffea4df0---vudolusajikafi.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/40871079925.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/20782570705.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160857c031ade5---merefo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a224555ad6---relezorakepasipexaxore.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00227fe11---vekekolegazajaranebopus.pdfIn PDF document text
    • http://renovator.cz/files/file/lejidejagi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xilozax.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096ddda2ec4e---wugalugimujoxolulotila.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/tuvuzogewilomani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=kogan+55+led+tv+manualPDF 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_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 17840 bytes
SHA-256: edfb8c8d1101bdee78b4fe2e3b29449be008e00c7688650df8f3de62a9e5edff
font_02_sfnt_off00013616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13616 10520 bytes
SHA-256: 0ae8189fd7bee5812b8fded4181de92f27a59e40ffc994761ad2c62501051c37

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