Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2138cb204fdb6d7…

MALICIOUS

PDF

95.9 KB Created: 2021-07-30 19:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c26f42e7a7c40bfb0e899c9170bd0b18 SHA-1: b8ffc806ed9a08c829217033240d6aa93b65c38f SHA-256: b2138cb204fdb6d7f19b22f011f6e68012445475d66868804628db8cc5d448c1
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and content point towards a tactic of luring users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=how+to+make+anointing+oil+in+nigeria PDF link annotation
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b18953786c195b74fed8168b45ba32a0/zopamotiwawetadowodepimad.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66934467857.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5880cfb5---62030068415.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/jebuwizuregakerojuxak.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/97756635339.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/80950421953.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbe14c12f---kezebagifanopesifavipefu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ev75mh5od03juorurpme3v2a50/kufaledevokir.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/272mmujhhhpfc9e144kcndko0b/1798661675.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad890d2e497---jutapezoj.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac4363024---21501548688.pdfIn PDF document text
    • http://htwy.com/upload/file/gerigup.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4e1c9ca7---lonozisozulubugepax.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/32l8p1c9rc3pth8j72ff9ur9eu/zejovasazefa.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/digazefusosulebipamu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090acf4b3116---pogolutapigevepuzugedufo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/aa4f210196d65cc8b933c8e238f7e7dd/10112356134.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/gerobutamajogotajijo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb59e40983---23474416838.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bdn2f66moln51nd2j36om4o3re/89699220087.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zutefaror.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/82167504714.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/pipavulevivivifotaburot.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e3086a486c98a0ce2a596d58daf81386/rutem.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5f79972615ee4f85ba6bba626da28a3f/vewuvojebosinuganomumexe.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_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 10452 bytes
SHA-256: 32c42e8f79861e0a5e05c90f834f3afcb3cd4100246fe607b157a95d9f6f829d
font_01_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14086 18044 bytes
SHA-256: e262a94ac104de966832697b3f6fa317794c7585a445ef9a6a738d87bb1d8b1e