Malicious PDF — malware analysis report

Static analysis result for SHA-256 eceb78b3c3d072ca…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 11:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3bf8d5b7919d223e92195bdffc64bb8 SHA-1: 42d992693dece072d62e91a370e7e32ece32e51b SHA-256: eceb78b3c3d072ca8d9f6e6b436a6fb3ade1df46d9c02a097c33dcac46fcdedf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external malicious content.

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 http://vieclamquantri.net/upload/files/76814340741.pdf
    • http://ms-domino.eu/images/file/files/82660423388.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca157876eb82d58c0d6602eaf4628a6c/34268601726.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ba48e3bfcdc5c8ee11ee9b75d3adcd39/buderapew.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b5a1533dc27241f8088731519c59c40f/29755764991.pdf
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/pevexiwumilalidesovewofob.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ccd5d933---gepexasodim.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/vowomuva.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ee42152e---50603112777.pdf
    • https://brmc.jp/user_data/userfiles/files/14514869600.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/09gk2q3o33apoepa22caaqj7i0/3773662983.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94b7239d61---39034298753.pdf
    • http://faradtvandor.hu/picture/userfiles/file/wasavojuvokusewuzudab.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ne2u005i3nhj8d6nkd7bu273b6/94614404736.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/59e1017e500daae607a4682dfc96923b/37880752539.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0562c19b---40503021016.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ed949c06---45539444019.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/09f6c637214896b24ce2e415e256c3b4/rujixoxaxidexunuxivan.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d16480466---28471475311.pdf
    • http://nanumed.ro/uploads/files/12021751011.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbfc7e1dfd---poroseze.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kre43fo83cjbfpubjdqnnfv87c/babulo.pdf
    • http://softwarefactory.nl/images/file/57419009623.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=where+is+the+most+common+place+to+find+diamonds+in+minecraft
    • 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_off0000f68c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 16792 bytes
font_01_sfnt_off00010ea3.bin
aa22eb18d165212dbe56b5f4fbff0f5d71915e6239c6e181797e95ebe1efcc6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 10880 bytes
font_02_sfnt_off0001279f.bin
cd134fa9c88b62927bd8e679af330f371f95d86ea01c6872f9869f895400c4bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 17036 bytes