Malicious PDF — malware analysis report

Static analysis result for SHA-256 7092847b075956ae…

MALICIOUS

PDF

84.1 KB Created: 2021-10-08 12:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: be0c11483a16dd3847d60dee9fc865bb SHA-1: 89cd6fa212ebbeb411d1da029771bc7b27044a64 SHA-256: 7092847b075956ae99c9ef8bdeec320136f891161da102d880faa1ecd64959de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. Heuristics indicate this is a link farm designed to redirect users, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly support its malicious nature.

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://huntic.ru/uplcv?utm_term=star+wars+rise+of+the+sith PDF link annotation
    • https://mcsfood.com/images/file/6745448256.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4o9rh6gsga9m0avg5lbh1bok6s/2913885894.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/tokubivaz.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/doxivovetobosuzamifobu.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/62995035785.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/40520171662.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/kudumovu.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/53827917249.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161573b3a3a4ca---sezepilipaxev.pdfIn PDF document text
    • https://bselink.com/userfiles/file/66796397422.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/76898149274.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/beposifed.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/zujinig.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/rilavepowifatesa.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/27008399909.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/laditudepanobofakur.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/88099781782.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/sesikesajilazi.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/pokibitexotusanudadudu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c7dfc24eed2cff5cc031b140deab59c6/merewevapegixo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5c639aa5---dosolu.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/67414398427.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/zizoxozogilawepubene.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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10320 bytes
SHA-256: fb7e46aab7ef7de6565e091c9f1bef4ebe566e7f4e859ef177b21840cb44fc08
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 19744 bytes
SHA-256: dc634be4a19492e070a50343acefef2c29e07aa957f9db02a80708090c994d6b