Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c30324af55b9a5…

MALICIOUS

PDF

77.6 KB Created: 2021-10-04 15:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d02c4e73c21a14b0c364c94968167e02 SHA-1: 759176f3a36f6399ac7476665cf059710812a370 SHA-256: b2c30324af55b9a59c73218ddd09bf8f1515c2048a9551040697e92bc28f2791
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=material+modeling+in+finite+element+analysis+pdf PDF link annotation
    • https://shih-tzu.ro/files/file/88927688790.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/wodefigirol.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/28022660679.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/aff579k62e7luit791nqvu8mt4/fekigupedifusosirofewe.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161511c7849550---mubamugugasij.pdfIn PDF document text
    • http://centrons.com/uploaded/file/668868972614026ca9b871.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/34855052150.pdfIn PDF document text
    • http://cartopack.be/Images/file/wawanuxon.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///68429082886.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161402fd70ec71---funad.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/orlq5ii2ugebaht4ootvpa774f/74052383646.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/1401789720.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/6303072899.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/jilavaxaxigib.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/jalivutuvoz.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/95449860774.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/fikebomom.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/ruwifugokod.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4ce944812---94846143963.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a12d187d79---repaw.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/zubujuguribowaledixaposup.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9c192b46b96048106ab2652c11362659/xisisovojenoka.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/83379061675.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/87312110766.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_off0000ca28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA28 10948 bytes
SHA-256: a719e988247c3e7d1f4e4be17833ea64578ec9bf654f75b5e0fec5c1f015a70f
font_01_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 17404 bytes
SHA-256: 75d8f8968b0dfe0a45f7d68dab84e24bb15cdf7b1b89dce9706823f6926648d0
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.