Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb0d5c975e96514…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 14:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ba498ebe1b096bd16641875685c746f SHA-1: 0271cdea246d5e84dedbdc602a54bd0d4c5aab6c SHA-256: 3fb0d5c975e96514998d801124110be82509ba8c1a5bc66122e8c6c667c454a4
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It utilizes a link farm strategy, with multiple URLs pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The embedded JavaScript likely facilitates the execution of exploits or downloads of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8109c3e694019c00c6c7f117ba145365/7120339690.pdf In PDF document text
    • http://limoride.net/gallery/file/misapoturomaje.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/64507724411.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/42809857466.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/jifowatesu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/12012937271.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/jijoxizexabe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/cdacf992dc6c78a7046f29f5b6a5e09b/gaxegeredogidoxe.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7e4f519292c667db1027b580e754c5da/zenokudaxezu.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/tisoralajafumugufajexodu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1a731633e6643ec27893b92ec9528cde/97309583114.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072747ed8ffa---97494619239.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160caa4b5ed0fc---46221910698.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7004f0122b5f7f323222067841760de5/barelaxe.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/17830867846.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7c408994---44496381521.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/13125750364.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16110cbc382b4e---67070956209.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nasojevuk.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/medumozow.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87d0dff6b65bebc9adb10a0f1640e3f1/85729900930.pdfIn PDF document text
    • https://ovalpolycoats.com/media/bojapor.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77dc3935d---vabopilavu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a166ad9db63---57115269485.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/65725863800.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/40efdc3b2742353c86636cab1a86f82b/fokoxipofagugugalajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cpk+and+troponinPDF 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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 18836 bytes
SHA-256: b97afacc337e2e3856f13dd4b0a45e66224253c74eb649ecb1c48fb3f5fa2a33
font_01_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 10164 bytes
SHA-256: ed4d041691705757f92bc7e8d7acfe6409df16d4314cba8e12bf83c412d0dfad

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