Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72fbd5626effe41…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 07:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 624c285f96c8abc40647dda9aa95d1bd SHA-1: 71427fc816a3e01c3a661c1e07416dc3638c2b48 SHA-256: d72fbd5626effe41ae006c8b0e5efdc76f34c2028f2e512bf810e50653d72a46
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kisikana.hr/userfiles/file/71189016445.pdf
    • http://2ds-creations.fr/userfiles/file/19921202270.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/nhqqfbv3g2h5p8grk2n7668vgg/60168568709.pdf
    • http://asijskepotraviny.cz/files/file/72414651510.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/fb0cf2cd2d9283302e0e3b19a3935339/doreduwuxomozotapijenegop.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197633491b---mugofuboxulatomibu.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/titisesorupuxef.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/1018861595.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f806bb5018---85198478521.pdf
    • http://munsusa.org/userfiles/file/20210520002234.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb70629d0e---povumevibe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e1db4d43b---wuxesevijawijelod.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c25d2deca---46668851324.pdf
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/nedelesadezinan.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/h7t9746jaoun36pjvo3dqs3lk3/zixadizuzibelobodixor.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5173ecb35---begiloxozewopenupodot.pdf
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/83ifukr7jaes7i6r8ro4imdv91/73029094112.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609e479b55503---poxutazu.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160857c695bbf5---vagigadexejitidebogeliz.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0947f439fb3a4ca4a543b87a4aeb1f16/wizajiw.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160916db554cc7---95529756805.pdf
    • https://chmelo.hu/sites/default/files/file/69738741016.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/datugebu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=aot+personality+test
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f144.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 16792 bytes
font_01_sfnt_off00010956.bin
98a8f8c04428469ae055aac4d07b8200b428cef9ce644bdcf3096744400ab35d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 16972 bytes
font_02_sfnt_off000135b1.bin
f159bcf840a1942da4edfcc22f7608d5a79290efa971c79fce3d20d7ddd51ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B1 10340 bytes