Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca08ffc4ecda2862…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 19:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf64b93996a08fc4e4c7a24e43c9c75c SHA-1: d3d2abf1cd91b64150c2a8f5c05504f18fd54752 SHA-256: ca08ffc4ecda2862f7f2f0d7b949ba625aa79d613c7053e823c888d3e60b995a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=muscle+groups+worked+by+push+ups PDF link annotation
    • http://hig-hegmann.de/userfiles/file/ruzuzanizuromekazoga.pdfIn PDF document text
    • http://chongros.com/userData/board/file/12753857842.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9e2a93fe---magadojujelaj.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/bukenixexano.pdfIn PDF document text
    • http://thongthien.vn/upload/files/lujid.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/66214447657.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614696f12828a---gajun.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/boged.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/tukakigofiw.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/49569213992.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/busowadi.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/27403652226.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/vinubijilafalamisifos.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9ac4a10e1---tozebenufajexulugomozad.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/ziwivitoguge.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/60580670472.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/99071107262.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/95518162975.pdfIn PDF document text
    • http://kodemari.info/data/files/zirolo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c9f88af49516212b211a8d9e5e91a7ce/bitawuv.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b1940b139ffc05062b114599a504d699/89978432827.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25454004428.pdfIn PDF document text
    • http://spiregene.com/image/files/20210906_232240.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161414dd1bef79---tegefojedojul.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_off0000b2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C3 14832 bytes
SHA-256: 0e7dd900a883b6f10f8d0ab190bb5b0da0e76d44c576497d32ae1c9531a260b7
font_01_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 10864 bytes
SHA-256: e38d313982ae24dab8782a29b8217795b0430969b33e7847c9e22004b4969bce
font_02_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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