Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a1cecbd6824327…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 18:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d61a6b62f495adf75e9c721ed9573701 SHA-1: c198ee7949730880581b6642902aef7172412740 SHA-256: 86a1cecbd6824327e3f63336d222952ee718f406da4120bf8cbfdac7571b3483
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine rankings or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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://webhosting4.net/media/file/67944100353.pdf In PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/45704854330.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/75716896895.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/37d84dcebf5763b86a4695a8f303c3b9/85221871668.pdfIn PDF document text
    • http://uco-kampen.com/media/files/vuwuvol.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/2367967922.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60F089118F64A.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/72693443229.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/46305645694.pdfIn PDF document text
    • http://dakmet.pl/upload/82583458632.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/kozafununofokuse.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160701ca475859---42135969239.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/93956432873.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/2462854070.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b3ea5a59f---dapusawomiriv.pdfIn PDF document text
    • http://labsshop.com/d/files/52662337319.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/mejuxebomal.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdb60dc9d8---ketikujapekexasadapovevuw.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ef0c318f0007d961e03ceb67922f71f2/58224975403.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/besuravoma.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d83fd3d78---gelalukadapudige.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8dh870o4tmfh3lbdeqi2pu3n2q/nametitol.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6d888bd4---32964677332.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/roxowixol.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa10e1f82---napunuxo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c931105f0---83233235900.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ikk695pla1nhgnqheapk3plii3/jijowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sun+java+certification+questions+and+answers+pdfPDF 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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 11172 bytes
SHA-256: c68a775613ca2ac1457bd3fbff5cd647fd5c6d288f4a734efd926b1926848682
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 19500 bytes
SHA-256: df80455fa384e446f03615d0760f7af89f022d7fefa4633419a3dcbf49dbfc3e
font_02_sfnt_off000136ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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