Malicious PDF — malware analysis report

Static analysis result for SHA-256 18237d0a620f7b2b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-06 09:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af6365672be310f7c14502cbad92055a SHA-1: 4c1e8283e2e96cacdda70e6f46a07514ead09c90 SHA-256: 18237d0a620f7b2b3bc3e7c9ba6499e0d8d74e80290e9b5bcfe6c768f264174e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. The primary purpose appears to be directing users to potentially malicious content hosted on these sites, likely for phishing or further malware delivery.

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jro20gguj7vnkudpt4g377pten/8281996845.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/webigopesewibimetu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a969d0847a0---22914283256.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/57337663049.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842a103f8c---11243487969.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/72g16lai1uglpiisd9uu48lih6/kewotiv.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/85985544040.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/vikejimidusolorezawes.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/34798857791.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/kiwitokumevajajitisivu.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/41011937850.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace1cf9cba8---18360497150.pdfIn PDF document text
    • http://tai-group.com/upload/files/jotonimivixofabusotiri.pdfIn PDF document text
    • http://www.asslar.de/downloads/suwozemegavujusaralor.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/40979940206.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/21423263874.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/pufaxaxeluzegokoxol.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/ripibudedujadofunal.pdfIn PDF document text
    • http://lblussana.it/images/file/21405145013.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/370be3a9c5e35a3b8dff3fd185a89c7e/zarelemesa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607199ca6410d---fezelipirimun.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/32110088066.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824dbbc9545---tukudiwaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=manual+lymph+drainage+upper+extremity+pdfPDF 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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 10964 bytes
SHA-256: 375f58419d2fb30d497b97fb83c5b1a041169a317e2995451cc13fa73a09f11e
font_01_sfnt_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 16588 bytes
SHA-256: f176ba30329c9be1c6eabd477dd4bcd76199af94964f0afc597b6aa56e0b5991

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