Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fff10aa2470864…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 20:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1f471cd1843ca620b50e6205f574d75 SHA-1: 8c3b7ae7d8818acd878cfed1b5e87358450581f7 SHA-256: d9fff10aa24708648e88a755d8e203be247e0c0695a9480b28fa324c0b770d49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/26675544582.pdf In PDF document text
    • http://cnpair.com/userfiles/file/sumujupanuvenaraxireb.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/makol.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/58387479833.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090723054873499.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613163529daea---wanuwevebuwaf.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/68424724927.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/kelodovoxox.pdfIn PDF document text
    • http://vit-physio.de/file/14858526196.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/58731565800.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ab67ee9e---romefazefudekakubu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac4e425bb---bowoburixanejapax.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/75452596046.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/11101503933.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081626295229.pdfIn PDF document text
    • https://olterus.com/contents/files/retidusavutijumu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/43409014372.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/76058808645.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/97738274488.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/dawubijexidomisipuwupimew.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/rojabubufimasuvom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=matrices+inversas+ejercicios+pdfPDF 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_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 10756 bytes
SHA-256: 08123ddc4f333e86c5c8ce0fc2c0893dc6891d28da7e68b53abb4ffa5a250c40
font_01_sfnt_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 20860 bytes
SHA-256: e482b2d20f28c5e7744f5fd3f9626d604f95a9f913207c6f45eb3995fe37d9c2
font_02_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1