Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c7e02756737db6…

MALICIOUS

PDF

106.2 KB Created: 2021-07-28 11:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9b95381466b2a998d9079d4769245d2d SHA-1: 9e344cacd7fcd24f1bacccfa4caff538d2ac6f3a SHA-256: 99c7e02756737db6bd6bff101679de629554a2061f7bca944d5d5d0327592e36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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 http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ace158e5fd---6892419653.pdf In PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/10442317823.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/3098273432.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/dotomuvaje.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/vopizupimutorexa.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/nepuxasarofanolisowowupav.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/na0p1j1ctabmnhk45ro86l2rop/37310745067.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/65880538148.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/botajizexelevowunevovod.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f7c9c574---75146546294.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be3372bc7---72363132168.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/37807741252.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/50512469091.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/25148554101.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/68818394860.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2f0586600ac041f9b2e7bfdc737b2f29/38206595578.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/sibisikutajefebugorogimez.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a86b0b89d---bekuwutabowikutopa.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/rudininujixarumuxezotavif.pdfIn PDF document text
    • http://cpils.com/userfiles/file/76005162063.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/45066267896.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/20349816001.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/2059781357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=excel+vba+pour+les+nuls+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_off00013453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13453 10816 bytes
SHA-256: 4f87e3a091d23c57e7a88692a4f20ec7afce50bcfd4768e0bd8e192cd6dd97f8
font_01_sfnt_off00014d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D36 20108 bytes
SHA-256: f9b7a21d66fc308d4651ce0cf03253e1f04aa49ddb1900970d18de5c02e998b8
font_02_sfnt_off0001805c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1805C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1