Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63ee1b1119629a7…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 01:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d67ec45af3f506401ec4410c999d55a6 SHA-1: 3ac54cbeff74a9ca44adf5000864d54dc4ba61a4 SHA-256: c63ee1b1119629a725d0edb9de34b671aac659ae69bf306e1f6b593398e45cfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and compromised CMS upload links further supports the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=spiral+saw+movie+streaming PDF link annotation
    • http://nacyc.jp/Upload/file/86419803400.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/98224803952.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447fe87f91d---kitirixofobawunevemobemo.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/78273033691.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/buwubamomuzarakolesibinu.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/jepajezofepixosatewo.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/60879462763.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/wefexutujesubixajufijegu.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210905_222009.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/3421229166.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/29723347112.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/dagosuwapubedagasata.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/tapemodotemupaxezumus.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146336b1b7e8---dosak.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143787947bda---mogokamixakopijovok.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/dulusiriniwupiv.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/sigojepigeguguju.pdfIn PDF document text
    • https://medius.sk/userfiles/file/gakip.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/28963637641.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/fevoxuxexotasar.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/fawunogawe.pdfIn PDF document text
    • http://videocycling.info/files/file/33632616605.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9a542aaa7---7612312221.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161427cf987a5a---34630331514.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_off0000b285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB285 10820 bytes
SHA-256: 52d0bcf1168c50623b6df443876567dcea66125ccc22d3d08e353df5cada2e6e
font_01_sfnt_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 15992 bytes
SHA-256: 8663479e36394f8cb5f83756284d7fccc5b760155f9005e924aa8bc072d1c2e0
font_02_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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