Malicious PDF — malware analysis report

Static analysis result for SHA-256 480d97b6c4fa2a5d…

MALICIOUS

PDF

92.3 KB Created: 2021-06-26 20:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9c90b30bc90ebcc8637204547663f2ae SHA-1: 84a58368d87e7c3205c8e64c4d84210cd3e0c632 SHA-256: 480d97b6c4fa2a5df4dad5b42c4d667938c4a422955f7e4e694677f3487d5de5
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a password-protected archive lure heuristic indicates an attempt to bypass security controls by encrypting a payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bomberosdenavarra.com/userfiles_nexo/files/konepejotite.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca85ab694---fibofixunirafedexunipava.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/22693279536.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeae07d18f---bitolikije.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a7575b66---49155064122.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/1aca3e20cdaed636588fb51ae46752d4/mukamefulitutiwupigi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d356df2220---400241588.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6njgfa90g1gn0sjpcrg6if4gu0/busewamabar.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/tenovapeguduvifafe.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/92346758991.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39e506077c---nizakijamami.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/sitjm22nvnq4tpo77t85c5ee9s/pinobawapazobafadatezos.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/76526792619.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/67485cc3b2953f2a30118023217c03f1/mifeparo.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/25791820685.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/79931666032.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/facee1b2921b88f0d0f75f8e829d353a/daveguzanididukidoxagemol.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7e06a9ae7e60ab59a9b8ba46fdb7d95/23503048264.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6b695f9d722036ccb8844804e9fb95a0/fenexadive.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/mikus.pdfIn PDF document text
    • https://studiorampinelli.com/file/70595341785.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/dazidipevirevatusewaboxa.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/susaputebezuxir.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/945cb93299c3801589fd7711d5c56f82/66204777818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=quote+from+ferris+bueller%27s+day+offPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/muzezak.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_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 10860 bytes
SHA-256: e6a9c1f28d159563ed1f2d08f436061c302bf921f6e9dbc0bf6e6ce1f6d79f4a
font_01_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 17368 bytes
SHA-256: ad08aac74067f2a53d2d7dda79e1ddc9d3c2ac02616ec58d0bb0b7ff1aadac53