Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24c16fedf0aa095…

MALICIOUS

PDF

88.6 KB Created: 2021-09-09 12:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 874adac28b2c8a271e76e4b856b553cc SHA-1: d224ff6c0fbbfc02c6bd1b3c38bfe0d5a3038f24 SHA-256: f24c16fedf0aa095a41062e315ca9a5f0ccdc071af32dd9a4613e0a69e37916b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and numerous links. The JavaScript is likely used to exploit vulnerabilities or redirect the user, while the link farm attempts to direct users to further malicious PDFs hosted on compromised WordPress sites and other disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/xorebazolag.pdf In PDF document text
    • http://myshopgroup.com/userfiles/files/vapamadivetixakadovoj.pdfIn PDF document text
    • http://turnyras.lt/Files/file/54745524651.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/83585123506.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/30592663996.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/zaxelofavipuwog.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/09863c2a6f169faf82d196ded57d1800/11657033994.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/8194991039.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/54233230234.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4fdb77c1---77668645249.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/61269270914.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/27050005719.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/83784999605.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/22919434223.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/63277501685.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/vaxefelobibifajegabaxit.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/liteba.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b11cd8f16---56722658796.pdfIn PDF document text
    • https://pcetravel.com/files/file/sojenoxejulipunuluwaw.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/tulezinuj.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/83200707366.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/zumafifelete.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/nafinutobalamopifokenij.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ganikikafokuvegizovepizof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=imei+tracker+app+for+androidPDF 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_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 17964 bytes
SHA-256: 45bb12334814db4de9e855ff3bf9c0d4f71eca15f26c77dd96e3c25ac1725b7e
font_01_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 10612 bytes
SHA-256: cec00a6db78dae1480ded71130f0d0ed12ecfa9f40f7ab68955a8733405e3b45
font_02_sfnt_off00013cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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