Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aec51b873d34125…

MALICIOUS

PDF

74.0 KB Created: 2021-09-22 15:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d9f9c13fd890354ea38e22054e69d77 SHA-1: b6c227b162ca6b056584b56398fac0524b2b1cb8 SHA-256: 6aec51b873d34125408b87711b686db0bb5b3243bdf76a306bb770fa256ff039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=dream+live+wallpaper PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452aeaecc5d---gegubevofebi.pdfIn PDF document text
    • https://123natura.com/stockages/files/rimotufu.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/53372807583.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/26368358294.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/jejefivugi.pdfIn PDF document text
    • http://milliondollardesiclub.com/upload_files/featured/files/pugivusowetafabijom.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/ridogazubopewobuzobus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a48060627---75465908338.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/13552640357.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/633443655.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/86923657529.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vfed0iuerq0etervhgdacvk247/6277131036.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/31264973317.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/93143645297.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490fb297f22---worodoruwefotogumexikomar.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/78276049413.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/251779007.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/lujoveduwabezotunav.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/5908858883.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/24406025648.pdfIn PDF document text
    • http://shop-cartuning.com/userfiles/file/fozewodoferuv.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109070133163021.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/dikadosesenobesuloxu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/44317566896.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_off0000bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE7 10076 bytes
SHA-256: 52066f004d14e06e90e96224e63127d2a53516c36eb4757cbc33f98025bb6f5a
font_01_sfnt_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 16824 bytes
SHA-256: 15d9db914a78749445954f8d0611696606843ac2b490ffb6d69765387e06a8b1
font_02_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1