Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d78a4665266257…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 14:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e491beaa03fd96ffea3baf4eb4d2a1db SHA-1: 9c362be12550ae7f991c88f560b69e2009690dc0 SHA-256: f9d78a4665266257bc3ca73e20227fdf0c4f1b86e83a155fea2d51c5cd847e93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=go+opening+theory+made+easy+pdf PDF link annotation
    • http://nandishoverseas.com/UserFiles/File/8769481584.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/jonegorajenabugizalevewiw.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/lasakofawofim.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd4aca2895---dizuwar.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/wimezeterupez.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0436ecff8a4fb3ff7948dce8e1d0c8ad/xegizarewizanuworanelude.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4112ec10d---negiwapezukaxof.pdfIn PDF document text
    • http://secretinvitation.net/images/files/95035880539.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/jedadoludul.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc0db6cff---josatorizo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/norigiduxakovuraxitel.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/bvo8artmmtra85i3dj0bp7dree/84624110955.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c57ef3d2c---40125866069.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0c1a76c4762c1c24375e7e19b9e90b54/mubatiwerad.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/mogexefoselu.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/61921356506.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/majibopisaguxapepu.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/togexezugusovaxepivexi.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b0ef2f68---23211421117.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/zokigirinev.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee51c7d21---zexujitis.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/33899811878.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/garumewutefovapum.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/26058930841.pdfIn 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_off0000b4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 15032 bytes
SHA-256: 85a9b6e4caa1c1c3732a1371b5f3171f10369100740d2efe9f08411d1274a0fb
font_02_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 11052 bytes
SHA-256: efa0bad056a6b5558897e3277264cb861a4716f6ac5e69efe3a54433f5e188e1

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