Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5b47d4db4fb63f…

MALICIOUS

PDF

90.4 KB Created: 2021-09-06 03:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37faa16ac55a075db0a69968d79dd725 SHA-1: a0f152c1df68477cf1fd971d72a0e7d53cc5179d SHA-256: 8d5b47d4db4fb63f4e45d5b15b0148a72483e47f0dfe64f923653dcf991a739f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. The embedded JavaScript is a common method for executing malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://coretry.ru/uplcv?utm_term=equation+of+tangent+to+a+circle+pdf PDF link annotation
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/28922301194.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/ridexudezin.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/70745810288.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/87ddbiirgaiit01vb8amk9cl56/73642567940.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/nokufetiliv.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f77b7fb65fa35c11c1993531973b46ac/rirofuligadisunapodorol.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/xuvewi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xokaj.pdfIn PDF document text
    • https://makenie.com/upload/files/xafokidadekowi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d0be9f7ace6c4315194a4271af600193/90613129913.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/tobirozalapusesufunopi.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/nimetukaxopa.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210706214459.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/79286b68fde64b1a72a4b8198a916869/bidogelexorozobozu.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/7857404641.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e982a39bd75750f2adf7ce465503fbb4/masubebubadopikejusemiri.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/54184413500.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lqkb5gp7negrnbh2n9c2n22787/sewusuvazujedezapuwefevan.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wunizoxazavesotig.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fa63e77ba4d---47992211432.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/fobuz.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0f9195643---91626566754.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5168a46225---fujumuxinebutevusoxikaf.pdfIn PDF document text
    • https://tangentemag.com/img/file/dotudezalupat.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2dad68489c6191e32bc5ad0516379e9a/10448142069.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a228733e359---joxewewuwepixibadez.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/mavepabotipajir.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_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 10856 bytes
SHA-256: 02f07e6c72cca1052459d90c96e759c623127d9b21555d20aa0af5fc9dddce79
font_01_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 20276 bytes
SHA-256: aa692c958d90ba4811eb4b3dc6dc835dbdc7583b86b4b045afc5fb7a27501dc3

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