Malicious PDF — malware analysis report

Static analysis result for SHA-256 2305da6a6d46ddc6…

MALICIOUS

PDF

92.9 KB Created: 2021-06-27 04:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb5e64f3452173287c7b0df1ae020ce9 SHA-1: a095f8130a1ea389211561c9ab475b3aa88fcdec SHA-256: 2305da6a6d46ddc6672070a17b0ffe5209557002485e52e5788bbccac90d5b23
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and an ML classifier also flagged it as malicious. The primary function appears to be directing users to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b988c80c2---zawilekimopaxubifunote.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160799331a3150---82012352344.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cd7394cb0cc71c02ed5a439115a40e08/dokoxovejelilitapazekeka.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4cjs9op52r4ulb5oer7fjousaa/lativogidopamifovok.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8766dfd5---nirarali.pdf
    • http://stinpo.com/ckfinder/userfiles/files/zopovor.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ak9qladc2u3lgi51ugvuc3b845/33754477776.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2db8794cb4484e7ccd8eecd34156a892/voxujuxaludozulebukepu.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/27168df7a902b93fc4a98c4d33e2eb0f/2636710924.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5e24d30f472847fba5e1d8b92f4ad20d/tegawugugowodewiro.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/tovimod.pdf
    • https://szabobuszberles.hu/files/files/73489543888.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fcf84a82f---61212771815.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fa224f874---rawogisanosa.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/32365250297.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pson167eoa97ui6a49rc06pilh/57864075256.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f032813140---80669277700.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ddc31ef7d---34480590925.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a81ed7cf71fa716938069203affca723/24991246376.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6f03817db458c200c4a439c540385952/ravapaxo.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/up0h81nie38lu81i9tsmqir8eg/15235249864.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800ccf2f03---rofuzadojobipe.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/6mk06oblotvci16mi55pf2h42u/90648267353.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9fc00d10c---vuzibukafixug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+was+one+of+the+first+monotheistic+religions
    • 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_off000103aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16792 bytes
font_01_sfnt_off00011bc1.bin
c21562028f24a18afeba43dd6570fbe8f890215eadbcda8b999bf5934cabaea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 10864 bytes
font_02_sfnt_off000134bd.bin
8d7f7c669ff76de0af9225125147a7122e8ac51a0592a29f98ae3ff6c66bf946
pdf-font-stream PDF embedded font (sfnt) at offset 0x134BD 19292 bytes