Malicious PDF — malware analysis report

Static analysis result for SHA-256 904be0ef0921bde7…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 08:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bf7800622e3a30af76fcaa436e16f0f SHA-1: f9f5b1907883406a6c69174737abcb7c2cce2eca SHA-256: 904be0ef0921bde7afd2dd4a683ab003c6c89e986b7a72b6a95c759ed6c79a17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded JavaScript indicates potential for client-side exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=android+phone+as+chromecast+receiver PDF link annotation
    • https://keluargamimpi.com/contents/files/3399697417.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152640600d35---sebowofenanubofa.pdfIn PDF document text
    • https://motoralbini.it/files/file/zitizoxisiv.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/49599108991.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/vatizodesapulekevidiwad.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/22171373792.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tegumusasikaki.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161402b26f2fea---bizukevumadutemaniluvi.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/79706379055.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bcc533157---koxorejogi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6828d1bb---sekawogudiseku.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/dudoxavetejabo.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/bematusumuja.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tudop.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6b6ba626bc95ef62a0890ba941e303b9/95028038647.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/81771524142.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/1780228856.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca869ae10a---zarimerupefodevezupog.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/notowujakalolax.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/4935096444.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/36042523566.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_off0000ac42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC459 10780 bytes
SHA-256: 7c7b77d10bc1e7efe185922184f3361a790b73e343f6d2fffa97267197a61023
font_02_sfnt_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 15504 bytes
SHA-256: 09f7be50550e05beb230aa2fc80ad8a1cbdbc4bc89afdd8bd906d815f0ac95c8

Open this report in the interactive analyzer, or submit your own file for analysis.