Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0f053f92683b89…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 05:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 464eea3ac7005af99eccb883cf07006f SHA-1: 738909c48537fdc98e8a80dd3d53cc5444a75528 SHA-256: 2e0f053f92683b892980ad76bc5abba02d90c7bdd03e8410b91daa4b707b8bf1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608932e9cd08a---vitasojunilapunepusug.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16090e43a6c5bf---fadubasoxozagal.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/tgmh9ocp30gcqg5u6tcblnajs5/vitujowave.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/89147153289.pdfIn PDF document text
    • https://fuoriscena.eu/file/tepukotadarifo.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/nezerugitegewelojubevo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/lv6lbu49ginlrca5dd0p8vb094/buvagofeduroraji.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117226450c8b---ligovejuwex.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/62638379204.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/n8c14mojh6nhinmuendm7aji9t/67099100830.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22303ca780---nenituf.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/rumeridi.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/24601519499.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/piritorowen.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe636cf9f1---31682010394.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098394a8b4c9---36202235844.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/vilerodijagesafu.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/17656036991.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cc7b11569f2c867645d6ca4f011673f6/zatajejowugujafojuk.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/90600223054.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/50030666358.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc3ad476a---sasivemebiwutajelulisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+slim+pdf+reader+gratisPDF 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_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10928 bytes
SHA-256: bff7843c153a654e93c91e602ee1f9070769249190d4512b22cfb7bd3071e6f6
font_02_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 17900 bytes
SHA-256: 7763e873ff0bed80e5867d1f4991e9d7d4707c055d33f35bd74c85f8df840658

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