Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c20238facf0ff6…

MALICIOUS

PDF

77.7 KB Created: 2021-06-09 03:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69aef9734a59cd229c1b49867f6c87e5 SHA-1: 8e88f3df5bf9f054f6848f3de866e485455d2a4b SHA-256: b2c20238facf0ff66b939d8936ed9141f62ed67cd349d87e3aabd062e101adf6
204 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, exhibiting characteristics of a phishing lure. It contains multiple links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and password instructions for an archive further indicates an attempt to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=gallery+vault+pro+apk+download+latest+version
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f2228a73---duzikowaxoxenekoj.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cc164caab278e2a025ca0e73c04faac2/85993367735.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608217e852516---61094964631.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c7fb76477---19312771111.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ba5d33ffca405c40d8fe243c62a08c1/ganojatizo.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7589d32a7---taxopodujeviwogifeso.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3d5594a9bd176307e9f554aac5ac1384/86544191017.pdf
    • http://arch-teh.com/pic/userfile/munepizijojorilaxiruk.pdf
    • http://bjallstar.com/upload/file/740871204.pdf
    • http://fitviewer.de/files/file/55436904171.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/62155164128.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872874ef08a---banasuxepopemumopo.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lnrl7c7onbqorepe8vs7c63jni/vumidulebopafim.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/bd25ff1bbea1e9ddb2f2b3eaee26ab4c/xesusewofojetovi.pdf
    • http://alhouti.com/userfiles/file/38279896502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04d.bin
1b2a392bbdedc04fa9231c4ece29615e3b7accb678d3b4b115cd849aa6954677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 5304 bytes
font_01_sfnt_off00010287.bin
303dc0d8b1441e75036c49e84893d1e67596da4cf5a2d29b2c05548409191c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 11012 bytes

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