Malicious PDF — malware analysis report

Static analysis result for SHA-256 596fefbbcefcb287…

MALICIOUS

PDF

94.0 KB Created: 2021-08-10 01:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b4073e8e96a7c1782af46e36f46ea85 SHA-1: 1f6a5da0abbef96e156f244f60e33ed0e4e33a67 SHA-256: 596fefbbcefcb2875993b9874aca971ece49d8cef589c9d9590c888980b9398d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The primary attack pattern involves luring users to click on these links, potentially leading to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • 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.
  • 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://mdknoodles.co/uploads/files/22569774064.pdf In PDF document text
    • http://pttaccounting.com/userfiles/files/65713227219.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/30868805132.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/621ralh2beqmvfsf47uuklksr8/tejodovanupibe.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/h2f11vv53jcv7n7bu8p8vkv024/21130513682.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8b88ec077ca5da5c1858ea25cd76a916/3856106565.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/76383938056.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2da667f95eaca456bbccb3225be5047c/76122122020.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c0119e3d00295385eb8cb0db0a0d7dc1/1933585878.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6d8692a5e---zetikanijavapopu.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/44666880300.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f577d2a757---jevenezugizo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f09d43920cbbc71803d34e03bbabd802/sedafopupodumorexaj.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3742f49f1f---terosebubipefemepimeg.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8e862755484b357a2f07fd066749b18f/fudatiferigajeturutipu.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/65324540514.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dosubanigufixeviloja.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82947374587.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/rimusuxurasivetewizan.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/rojenoxuzowisugaja.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085409c1c1c1---63688674365.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/gopefowurife.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/sitawojuberinigurijos.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/cc4c29030680cec4e43e0b4b254ef15e/12626611656.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/97691055589.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/gavoxuxabode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=%D1%8D%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D1%81%D1%85%D0%B5%D0%BC%D0%B0+%D1%81%D1%82%D0%B8%D1%80%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%B9+%D0%BC%D0%B0%D1%88%D0%B8%D0%BD%D1%8B+candyPDF 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_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 11776 bytes
SHA-256: 0d37999a0eed509116ef544055ac8d558d58fb65b692f110d826a71594fdf2fd
font_01_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 24604 bytes
SHA-256: c45c303c98620c5eb1882f0f8dd0f308102c2455de128cea54c9bd0f2588f3d0
font_02_sfnt_off00014d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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