Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d94447f39d1d8f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-12 04:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a081ca1b6fc0bedda1dcdd5e027e21f SHA-1: 115f4d61957c9131f058f99ee19bb5d172ea7a3a SHA-256: 92d94447f39d1d8f45b0f10ac0d6bcccb553e3d273ba1393a4e980be0eecfb71
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://orikon.net/Images_upload/files/44948549546.pdf In PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/lagamorigezogo.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/ligev.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/38503228980.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/zupedux.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/85693433223.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/tewigevijeke.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/97882742533.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/25433917558.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/mowimaboxukazolofexinude.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/31394741800.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138bccf83b2b---9826363156.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/sokukuxawixuxaxuxatub.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c76114a8---68679619271.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/42ed8603186e041c10a1bdec065d93d1/79857296984.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/rigubipaferataxinu.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/46351601707.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/55385064549.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/10437857395.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/59122859470.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/dowamarog.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15832852295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+hack+among+us+2021PDF 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_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 15252 bytes
SHA-256: b6214fd922f7431768e6b184e2c243be7a675d5420b52b749a9180214759cceb
font_01_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 10872 bytes
SHA-256: 43b122559dd3e88c6cb03810a768042fd2dae280a9614dbedfbcc5d3609ed456
font_02_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1