Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda2c2ce2ce92278…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 06:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eef569fddd2e35e6af60d7c0e2901cbc SHA-1: be1a8743a5f5030ad42cb9c76a1477515990acc4 SHA-256: dda2c2ce2ce92278d1bf39f091f83c11f893185d95d5215d6c193b9b1d09c4d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or further stages of an attack. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://stalmost.pl/userfiles/file/35940245892.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2afacda1f6bb1fb4d92241496e087083/6450456167.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/vataxabolov.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/8485501835.pdfIn PDF document text
    • http://maidichike.com/upload/files/sojugununofijofidoxemu.pdfIn PDF document text
    • http://anindecor.pl/files/file/29481390310.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/246633776a54cf6ba5722754241d5754/49637288842.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/rowumofelivimifux.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/ludigogapuburaj.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/tevopake.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/91633385961.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/limukevawafoxutirekokere.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/f0e6ikqivqj8e69cpaerm5ggra/fabilivepuvasepivukim.pdfIn PDF document text
    • http://apvn.info/userfiles/file/90148046082.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/nafuramobupebokunuluva.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c622aa6b4---padekipovafizefe.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9gl61eh5497gn2pi0c732b2bms/wikebibo.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/zojaneza.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/rabosogowebemusipu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/shcriorcinfo6t46om7m9fvpip/webugoma.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/58588087995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fisiopatologia+de+preeclampsia+pdf+2017PDF link annotation
    • https://doi.org/In 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_off0000b4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 11180 bytes
SHA-256: 7a77344cfa6edb8d6df6146b4ceeaf6f2e39d382bd726eb0c96da50c56b9d860
font_01_sfnt_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 17092 bytes
SHA-256: 1bfa9bd67c73fa4bfb14c93aadfa9ed74bb67e99233a553c894f9cf934bc95e0
font_02_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1