Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ff69741ecf9bb9…

MALICIOUS

PDF

85.1 KB Created: 2021-08-05 03:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 745646eb7c704659e507ba2dfea10bd5 SHA-1: 92f5a0d989735447611fb815fb96eaa84aae6fb9 SHA-256: 71ff69741ecf9bb9fb298adc971e3b4b112628b2efe7bd433397895f2d1d737f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://poorclarescork.ie/images/tonapo.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/393cc9faae4dd2801bd406b77fa3a59e/27284125179.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8859fe0a5e8a9fcb6ca0b6c3bd3cdaac/56949627815.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/vofarudifezabadul.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/au7v5d6u890925l9hs6iaisvrt/69956114292.pdfIn PDF document text
    • http://sam-global.ch/files/file/tabesog.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/masulevulivuwozometatepo.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/gelosemijagut.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0bfevdj8pfi8nca7lh8s9mgnq6/wopawoko.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/rfhb4604btml33isfcfmuno052/dosinatogaw.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/rimizevugedixowolesidelu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2875dfd0---86846924099.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/jodawev.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/61041679783.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb5a8f7f8---tajutazek.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7cdff6e11a95463e14f1aa53b35257d/piwekegitijubiwavelejopi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f4e27a8e09b990f584c25237e53f6fa3/nokajavilekotu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/251e6cc6de8e43e9cfd36c0da3c49921/85222619008.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/26527643793.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/50532381804.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/16tud9qdhhgnhpun19j1que1eo/92450903227.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec493aac19---8015500708.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/guwowu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/44c9577c5dc36bbe83bcc85e7e46147f/bivolubogasejow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=current+affairs+mcqs+with+answers+2019PDF 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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 11260 bytes
SHA-256: c83e147f30cd4ec01284c900355ba2f41221b100be896c266cdaf8a3c92c7cea
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 17456 bytes
SHA-256: 312bce0cd86aa5241770c58308b3719080dbcd6da47537cf5106713b76c7c7ed
font_02_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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