Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcee3fe7de00dca2…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 19:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3b1bc50d0219de67d91108244ed92d1b SHA-1: 4ecffb17516cdd0add5b1ec56ba211f00e1a5622 SHA-256: dcee3fe7de00dca25d7c9aa4c93bcca36fc7c1fe7a0941cba42438734d109da3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage trusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=vegas+crime+sim+mod+apk PDF link annotation
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/46677147482.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb0d3173b---97583850652.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9d246a34---gotubus.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/30026515019.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/15381881274.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/33117999507.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910002125.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/27676444519.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/80247563681.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613922b6d1b05---kobuwetonimaluze.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///30341255.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/teseje.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/53253311335.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea6974989---95312536040.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/zuguwirobujelusemuri.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/6293066410.pdfIn PDF document text
    • http://www.centralperdana.com/file/78173335719.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/42197476877.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/23776437299.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/8135485020.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/kagurupavofefopemomepu.pdfIn PDF document text
    • http://machin.kr/userData/board/file/vikab.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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16820 bytes
SHA-256: 5cbb6214375cd4afc7a1a77aa583e53b2ad439b5ff3c8e5395a16157893bcdbd
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 10668 bytes
SHA-256: df4eba9c3c966852e21f06d22339f1057586971b5f6f77c30f497228d079987c
font_02_sfnt_off0001189b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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