Malicious PDF — malware analysis report

Static analysis result for SHA-256 042ba101a357294a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 23:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96fb9dead1461be462874e50112e320e SHA-1: 764a7a27b51e64bf366da0793ce24f515ffec35c SHA-256: 042ba101a357294ac768f49bdf81ab09363607e7b7edd0e4f23e696cc230450a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded URLs suggest an attempt to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161401b69d6a65---74199831686.pdf In PDF document text
    • https://vanphongphampmc.com/upload/files/xonavojafado.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc8226a6a---zilugupabafazidetapu.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/95333916770.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/31191145167.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/39150163004.pdfIn PDF document text
    • http://leguido.net/files/pudaforezekanezorugokamoj.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/7551575789.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/14342521306.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/65412988417.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/sajoruxitorepamese.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/mabejulu.pdfIn PDF document text
    • http://webs123.com/userfiles/file/79058199017.pdfIn PDF document text
    • http://att-na.com/upload/wuzupawif.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/luvirawepawofebulirekulep.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/6372056760.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/relemefu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143aaae64cb9---nonekap.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/88411765731.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/nabejumelokol.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/19c90277475c014c9d4350e94213dc61/nezezunamivatugawab.pdfIn PDF document text
    • https://loyd.rs/images/file/42769593828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+mobile+network+settings+not+availablePDF 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_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 18324 bytes
SHA-256: 2d82b2965557419e93eef0bc257466996310995b1c31991774868c098ca4a1c7
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 10956 bytes
SHA-256: 7b5a650c558877ff6e0a6b86c6d692ff9a39ee2318a12b42676e8ef069cd217a
font_02_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1