Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be9514a9c0bc04c…

MALICIOUS

PDF

71.3 KB Created: 2021-07-20 08:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1bdb7c7db483034ca06bdf9428c1e056 SHA-1: f14b3fdda8a70391e949e5abf8d9eac786bf46fe SHA-256: 1be9514a9c0bc04c4be988893259e52021c84fec359a543b8dff7445319f31d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature. The presence of multiple compromised CMS upload links suggests an attempt to host and distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a90cb9817f0---64314883.pdf In PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/35130865634.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/iogufp7jcrb7cim2u0u4j15td6/49271196424.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00f11a487---zevikuzasimavu.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/41803660847.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/napigoniluti.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/fiwudot.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda4df380e---52733325834.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2a46d81d51215f4625f2d70ac5d9eb3e/81655338827.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a2b87041eee34465533ae99c2e253861/21650333818.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/gapej.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/gis2jhpb8r26f429ki7kg7m8mo/videfupidukawoxonizipulil.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364586b128---58552218456.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b8b3cb1---11550062273.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b86ac6a3430569f9b821b21fbb79bd39/sazuzotolisigelobiv.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/wagubib.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f7330120---27431046662.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/fagetaxofapeparuxejomu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/g1lvaosiliron5av21233f2gv5/jefizavovuguzukuwex.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d500e40c54a---18078139954.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/25154818906.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/72774500810.pdfIn PDF document text
    • http://jump360.co/upload/files/20210621030752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+correct+order+of+increasing+bond+angles+isPDF 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_off0000b85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 15168 bytes
SHA-256: 6bc3207a9159987240c00f2e413d2787c02f830baa43f7e7034e1ad162f44a27
font_02_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 10860 bytes
SHA-256: 9512622f56bc7906095482634bba517df07667e40e41f371b11c03a92adb4df2