Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eea6a67694b41ec…

MALICIOUS

PDF

90.6 KB Created: 2021-08-12 10:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 414e68cd4f739a1917e71638287f42bb SHA-1: bedc2a4277b814ff2a3d996b2b128619dfef6f40 SHA-256: 4eea6a67694b41ec4e04838e241c4f6c8ace47803a5ccdaa7b99cf2dcc218490
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b207cf4c---50377292285.pdf In PDF document text
    • https://777mto.com/contents//files/13209984614.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072523fa77cb---55554004870.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/38851304067.pdfIn PDF document text
    • https://afayl.com/userfiles/file/waxuwilisu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/5055417285.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/87080273488.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/176913268660df0b0836194.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3b836eb0---36960880550.pdfIn PDF document text
    • https://stopserv.ru/files/file/tujamikorux.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d2f766a474e68c90f174f630232fb4fb/68862443208.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d63e952f---kikogefafopesobefin.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/75546226912.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/79183655418.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607132a77eecd---kufigesogodujejofozu.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/15351940409.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/25371625621.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/68486709908.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/72198129450.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/kogoxatozizolo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5812cde0d---72058929831.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/790211c197e6d59e184bda5933590cfe/pumizapunaw.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/mapatamixojogo.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/30116225628.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/69775191319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+calculate+input+force+of+an+inclined+planePDF 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_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 10620 bytes
SHA-256: 55f7b47a1a029377dae7446b519969fb1e5a8c33bd4dbc9a36e8ab84d8024ff9
font_01_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 17960 bytes
SHA-256: 67f9106283dd0d709e2c7173ead51942bb63da917c99f431be86dfcb93629604