Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf00228dd34c7dd…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 14:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a4d6fd7d7d0ce393840cf5e94931238 SHA-1: df973ff77629cc9990325922a142653c17937336 SHA-256: ccf00228dd34c7dd013378a49bb197d870fe34ec27186787dc673a9c3cadecae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=azhakulla+fathima+song+mp3+free+download
    • http://cleanyachts.it/writable/public/userfiles/file/rasenuvimimid.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426382def98---75430072871.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/mimijozinazoliwulutegif.pdf
    • http://epoch-making.jp/js/upload/files/retekaj.pdf
    • http://indianspringhomes.com/userfiles/files/gidupoxonomavumun.pdf
    • https://expomediainc.com/upload/file/33475830634.pdf
    • http://wangyiphk.com/userfiles/nijijo.pdf
    • http://www.galiantsolutions.com/emailimages/file/farusutavudibat.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22624965151.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/sezapukegavutiki.pdf
    • http://redigonda.it/userfiles/files/99207431837.pdf
    • https://charterfori.ir/basefile/charterforiir/files/purigevageveguxuw.pdf
    • http://mnogonomerov.ru/uploads/file/fudupirasitodamikamasubip.pdf
    • http://marcth.pl/media/fck/file/89568527357.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/b1263f1e242b4b3a7e6ee433376acb02/83103074159.pdf
    • http://petra-koparki.pl/Upload/file/30951709125.pdf
    • http://ideatity.com/ckfinder/userfiles/files/66699827777.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3fe83633e8ecf8076a3f58bcc136b1ce/nevavuje.pdf
    • http://wamer.org/userfiles/file/23473946442.pdf
    • https://tdfstore.it/file/lukewatub.pdf
    • https://efficimm.fr/userfiles/files/13264374610.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BE 16792 bytes
font_01_sfnt_off0000ccd5.bin
1bb47f4dc2af7f86d34d6fd7a3046a25ca39d262349e143c1186869f9b83215e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 11436 bytes
font_02_sfnt_off0000e799.bin
1a0fd27098f8a908b16042e191ea940517fd26eaed46b380c28be44ff45af27f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 15556 bytes

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