Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dc9e02632ca14d…

MALICIOUS

PDF

85.5 KB Created: 2021-08-12 13:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9aee5a7b1207cf3deb13f77e6a23c1a5 SHA-1: 654f776dfed4696d58f7b9feb60e04735acd8cdd SHA-256: c4dc9e02632ca14da480ed09ddb0840c0d07dff7d09b44bae0407eb7c8fc763f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/f7gfcsf44ietrbg3oo4g3lvojj/59140578614.pdf In PDF document text
    • http://goodtraefarm.com/ckupload/files/waxikupekopijezatapuf.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4930f75846e9b7bcc64e3b53a3e84c32/bogujofizegiboze.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/rajuxitonetiguzivapuforan.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/90793603475.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/dotibezotuvade.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/vojujifufo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/11934949636.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4f74dnl8gd2i5ev3en3g5hl3f0/berupesipifimopa.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/26097782769.pdfIn PDF document text
    • http://licausi.it/userfiles/files/57943530562.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/89094515858.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/xisofuluj.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/9978515711.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8218789384.pdfIn PDF document text
    • http://capital96.com/userfiles/file/nufofimurijizuk.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b16ac9302---25359598121.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719963dbe0f---xiwikik.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/meferar.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/98100665122.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0a5dda82021da1acec2622f8f97bdafe/girojazurofuzibebituka.pdfIn PDF document text
    • http://z500.si/files/xikigifalejirizelezutagop.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/m3euodr7uigh3stalqbjooo8u0/28750097774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ethiopian+amharic+alphabet+free+downloadPDF 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_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 10924 bytes
SHA-256: d7cf44075460e541bdf2e7d9756e72569a892f626b17ee7d8895757dee0a3019
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 17780 bytes
SHA-256: 9852985883eeeedac51c78b161f02b4bac7d3a8e24f7bbd50c263d1d3d101dea