Malicious PDF — malware analysis report

Static analysis result for SHA-256 109c439e0cd9c1be…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 13:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 975bb1b6628474dabfd08a370439e49b SHA-1: 90d91bf5f4d9805d3c1db57dc060459bd0b7b249 SHA-256: 109c439e0cd9c1be9336de7a527feea5b576f58e40b04b52c2db2ce828728f0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://globaldreamindia.com/webcms/file/9158427306.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614026e06e250---42580415961.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fca59d04c---futovekipimawaj.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/sememe.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/nitem.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/51368207211.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354d61da391---lizarogekamotisil.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/suvofekakogola.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/bewotebogupo.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/nawiretulebixe.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407b4257883---tegote.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/87479328577.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/lelezuxijenatarunorabej.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wuruladutotisizusukivosuz.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/81607921045.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/jifireremop.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/51105555381.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/77716828085.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/14287067826.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/94473020781.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/xazabejoduxaver.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb344df133---13250913311.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nijegukefew.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/27911346333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=art+set+4+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 22216 bytes
SHA-256: c73d31fed19abfa0ff4947b9da2bf10179d3c44037180ccb8d224fdbeb99dedf
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 10252 bytes
SHA-256: 3e1423790ec318431f2956a101d7ced1d424d77866dc17cd79e676909c0487c3
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E9 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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