Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a06bd5e1ce178d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 01:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6addfd6d12cb9c9b5dd6b5a376270915 SHA-1: a3079b27bd0a36a2ebb2e585f7cf0c932df195ba SHA-256: 52a06bd5e1ce178d2469874a1b3ab40339c741f086810682095b314089c0d3e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with exploitation attempts and spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404561c0e82---46770967374.pdf In PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/ridovumuseditonuwoxo.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/73709970574.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/20054993370.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/69190745318.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/99891916808.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/73lqlhreef1fpkmo0ud9rg51te/32207955506.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/safafizekit.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/9mjm436u0pns6hbcuekvnlkchd/49921484684.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902075030.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140875c493ff---xafojola.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614505b9f3743---7405288275.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/kosezozurevukeg.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/lamobovawaxipudebik.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/43645167055.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/wajexolijobedezanowimijil.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/7502464391.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16144d90c4e993---gumiguzetizopagebi.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/lenegarotosupak.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/menubejipinunawiw.pdfIn PDF document text
    • https://camelcarpet.org/d/files/59433360809.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/62672249701.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/21534693012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stem+cell+research+controversy+pros+and+consPDF 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_off0000bbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFF 15752 bytes
SHA-256: 1508f61da4becaec191aaa99089205e4db2a193c391211107e530075647e4c63
font_01_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10944 bytes
SHA-256: c49d017f36daf1bfd08b7be7604961835e61e23596c60c7205f41217fa24b891

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