Malicious PDF — malware analysis report

Static analysis result for SHA-256 18abff328491c67e…

MALICIOUS

PDF

112.5 KB Created: 2021-06-19 11:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e6cf170231ff50707fb6423aeb004663 SHA-1: c98db9918c544597e0494140f915e675b65af2da SHA-256: 18abff328491c67ebfaebf9fe019a6c962ee7ef3b85c1faba72621e6712758ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=mae+nak+phra+khanong+full+movie+eng+sub PDF link annotation
    • http://caryhigh1987.com/clients/41333/File/xexefoni.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/93b6ba8f5551eb612a85cc6d13f65212/gobikal.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/zezilonoraxutal.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/86018717655.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608651da4671c---64048429365.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b1a6aaf10---73511968318.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/37637472942.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be361a962---57922481635.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d4e448c9---40911567261.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/30068130268.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/lowutazimufenotez.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a3e6285c103dbbf322788f4a723deb33/81777468876.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b0ba7bbc---5259349725.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/2164239283.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/be254046affd2f6dc190f81be21cd537/799998961.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14403 5584 bytes
SHA-256: 4738ef77ebe8aabd4525e0a799081a5e1f63c5955b0dbbc2a48d931cad5c3bf5
font_01_sfnt_off000156e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E6 10180 bytes
SHA-256: f199862a6c941e51c53499afc0f7a60712e6c60be9872e697ad97982da7f7ec5
font_02_sfnt_off0001738a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1738A 13464 bytes
SHA-256: de04879828acb2b13e6f7394106739fd962b12a881b787792bad4fb418cc51cc
font_03_sfnt_off00019e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E7E 16336 bytes
SHA-256: 27a2ebaee2a04db027069d3d0970ef6e68b32f8184b3ebf80808a8df0f24a276

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