Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fbed4cc6470664…

MALICIOUS

PDF

68.4 KB Created: 2021-09-15 00:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7df2a119d27ececa91c2431f31c1b1c SHA-1: e1a84ebdb4f0a3e166fb5664ed9ed2e7e4b3d851 SHA-256: c1fbed4cc64706641baefd31c20fdcecdcd01d424b2ae09a79b98b75561d2869
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also hosts a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The embedded JavaScript likely redirects the user to one of these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://shamayachts.com/upload/file/zososegejudadupixozepefo.pdf In PDF document text
    • https://ihotel2b.com/upfiles/editor/files/27042040159.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/gesovutexanet.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161364c4bea5f0---6399183835.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/wimadegojorowatiwavuxos.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/18311397342.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/27155230173.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/60651606070.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead9a9147c---82601116344.pdfIn PDF document text
    • https://protrialse.eu/files/files/kivebemaginetuw.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/84869814810.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9010dcfde68643a638d1deb9e9e4a40e/52171690726.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112334af52---kotatufusegiponurem.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/85632229967.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2047dd1fef914692c7125149cf850478/52290225721.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/32915105352.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161411424a18ca---78065538789.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/wadivuvuwux.pdfIn PDF document text
    • https://cian.hr/userfiles/file/lulorasomefikomudujiga.pdfIn PDF document text
    • https://icbacademy.com/upload/files/62021981352.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/11811543874.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/47968134090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+ball+kai+2014+dubPDF 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_off0000ace7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F9 14984 bytes
SHA-256: 1467d0ab01f46632492f3c1e389e235970cdf66f47fb48534a296678d83f2e51
font_02_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 10732 bytes
SHA-256: a05ede5defb69cd38ecf2be313055b9cb06a2e1c79685cb9f5980054649d2904

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