Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46ef13e2d69700f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 08:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e666a860b8bdac4ff23a6d294a8e41d6 SHA-1: 49aa6a6707a4785fbe6c9271c397d00826fa41e8 SHA-256: c46ef13e2d69700ffce584edbba78facfd41875a4c376fc3beeaa7e7f82178da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of external URI indicators and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=best+smartphone+brand+in+malaysia PDF link annotation
    • http://mylodge-naoshima.com/49511567018.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109011602434104.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210911065259.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tonasowupibajusu.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/62674233757.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/54782836283.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/15239843467.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d93f261ea---xovabilumebifarevosawexek.pdfIn PDF document text
    • https://parkettworld.com/upload/files/pelirovovuwutabigoj.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/56938333170.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/rewusibukixivoketasasop.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5765b9fd1778244b98975613ce22ef0e/vedizagati.pdfIn PDF document text
    • http://quinta.cl/upload/files/80629057947.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/97767765126.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/nugugulemolulida.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/79769143011.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bac75617ed5ae30c5796630f0e1eddc7/69518266359.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/43659510207.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/nemapulozebu.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/faxetugesibag.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/velated.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631177245275779712.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137623bc3b5f---kebuwapenalonu.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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 17740 bytes
SHA-256: 5b414d2f2c677e77eecd5d4a66d0192fc67a5b8a3d26c5f042c60e978a3ac4fe
font_01_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 10964 bytes
SHA-256: 01c92bcb9f899fadbc136be647b8be68ed9efa2f6a3cc612d50a556477bf1c62
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1