Malicious PDF — malware analysis report

Static analysis result for SHA-256 114ead0bfda9ad21…

MALICIOUS

PDF

80.4 KB Created: 2021-10-11 02:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0734607471c096173a973ca4c0bab9ba SHA-1: 16f075902d076027eb14bc7c367030a3f82d216b SHA-256: 114ead0bfda9ad217c602a9dbe4c184765afb91c17abd16a99e60a025a90ad8d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to redirect users to potentially malicious websites. The absence of readable document body text prevents a more specific analysis of the lure, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=citing+textual+evidence+worksheets PDF link annotation
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161426ebdde7e5---jonemifagegavisafite.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/movewisuxuromexiv.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60f384894---95660931264.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354244cab5e---18889603304.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/26269145314.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/sadisidukugobitupodabibep.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210914182242150.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/mewilakolugazisobe.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/25471459845.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7997bdd914c550843f9f93cd3dd5dd9a/sonodolediveropor.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d78e90bafe4f3e5c7b2a612e46cdcf38/semudub.pdfIn PDF document text
    • http://martonelektro.hu/files/file/87888522528.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/25973855123.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313ad2d28c---66749492504.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210913171359145.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/25297161191.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/xililotemiko.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/bolanonuv.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/kenisinapitid.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16155619e81b77---63197479601.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/fabamogegiwawitesusax.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b63e68c63---bulozipupanupunomugadez.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/fevife.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142b08ef0ac5---32318538890.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_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 11124 bytes
SHA-256: 69d8de72c55a129ef5b5ea7de4b1268fe034f2d6e4f4995003245a0d0840af1f
font_02_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 17568 bytes
SHA-256: 820c1c58ba950451ed07265fcc130947b0c015c41e7be88354ca982fd39dc9c9

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