Malicious PDF — malware analysis report

Static analysis result for SHA-256 9739351069e5f0c0…

MALICIOUS

PDF

80.6 KB Created: 2021-08-27 23:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 00dc811d11ddd85d2d57e97f83eec864 SHA-1: 1f856786456ed9a2c2e9f445295d671c743a6fd5 SHA-256: 9739351069e5f0c01edcdba2012b90b1926d58d35f5efcf4d251413fcdd36d2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=bagel+bites+tray+cooking+instructions PDF link annotation
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d129feaaf3---60879337189.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/42823815456.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/vuvilazu.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/54574487408.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/43857870183.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/jekuk.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094854d3c995---kogapemabusivitaxobip.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/miniruriwufitoliferajeke.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210626124012758162kpp28p.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/vikinajirup.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/cd40ddc18e1bc6889673ce480ac9a7ed/20705249613.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f744276d10d---ribavinere.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c6nevhbv5n4mtr7giqbhp8mr57/66767085945.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210818_35FF998DBD00FF06.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/laxiwojukidelu.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/mefirojubodov.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/18378102013.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/biboraxuma.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/liruwoku.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/91gdi5h1d7krp47rl10dao0767/jumenonuw.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096854423c86---pokukawebadavofisugimafon.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/vusubafe.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210714_70F39A3D9A02180C.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/35975907748.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0379b66fd3---rugexiwugebadijar.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e9dc4d99861eca2470d50ac652eea063/22823100841.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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 17140 bytes
SHA-256: 4f4cb4d4291f74cd89d3a9b05e8af09629aa38fcef77fd1c947157c1ce6aa07f
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10904 bytes
SHA-256: 3318b13a2c0f2d7e93f2dc94106fecbc49961d7d0069909b7328d6872fac780c
font_02_sfnt_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1