Malicious PDF — malware analysis report

Static analysis result for SHA-256 041fd1a794e5985c…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 06:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c4517066a5501a04fad5fcaf961974f SHA-1: cbc5536d47fe7b5dd413c1fdbbfb06d2f2c5d91a SHA-256: 041fd1a794e5985c67772919ed1c14790d30a7d93344aca7f8b9f8194035e1ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=galaxy+note+10+custom+rom PDF link annotation
    • https://factorysales.com/userfiles/files/logomufo.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/38004637185.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/92967672865.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/87417672151.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/janokixu.pdfIn PDF document text
    • https://egf.tw/test2/images/file/xopotari.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/84387714181.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/zivajuxamu.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/kumajadeda.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210921033344.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/rokiwixobodobofavaxe.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/31763506609.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c12b7e0afe---63767052099.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161408d780b088---jevuwagaja.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210910141334.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/nuratujofupaw.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/sujeluliwu.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/zapiziviv.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/dokasizuwoditu.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/36163922427.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0b148a3d120912331f1975cc6456a12c/minifowuzakakugob.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/xunedefasimulejunufedepad.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/wekupakutigeporozesomidi.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_off0000aea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 14560 bytes
SHA-256: ade4e67d9030c6ed72c1bf290339ecd1b3136b1a0906e646e7506ba452e33cf9
font_02_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 10828 bytes
SHA-256: 62193d070ffd67ed5793fc369280f7efa65b8a7c728bdb36f2e4d61d59adfc59

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