Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68dc3959223ebb9…

MALICIOUS

PDF

111.4 KB Created: 2021-09-04 00:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87892f64a78c4af12e0dbec1ad89fff6 SHA-1: d793758d4bd386b145c153ae69d15121c4b59d97 SHA-256: d68dc3959223ebb94dd847ea78879a9a36a7fec3741f610f4d896f0856f88ff7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=practical+geodesy+pdf PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7572c040---podawikil.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e70965001---32986118909.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5go5csvihsraf4v7v446g7moi0/51832265524.pdfIn PDF document text
    • https://citronel.com/userfiles/files/41723758571.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/02a56083a00638b1045f3ca937880d19/lonezosaduvegon.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kunobuzukanepazirat.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/91194215006.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/koseferowewovagigel.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/37bfb98e897eaf34f6961902867118cd/lamivu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/6008960277.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/loteworexulupuz.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/sugukilezesax.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/92c409b7990cb9de27305f3082f68654/17690402217.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/44191896460.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/14bd72eff282f29a92d8013047efccde/66857379650.pdfIn PDF document text
    • http://ibb-online.ru/f/file/79248650757.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ccba66fef---90644376472.pdfIn PDF document text
    • http://e-district.org/userfiles/file/86238546528.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/7809717320.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/28693679165.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/vomalesozeraweraxug.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/pexebugajifakujifufuv.pdfIn PDF document text
    • http://homeopathyhk.com/files/93818662465.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/16103602131.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7526b0ea8a7171134f36bfee64727218/54151580856.pdfIn PDF document text
    • http://ge-mak.com/files/minizixi.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_off00014570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14570 10804 bytes
SHA-256: 298e38e22bb01c99e4c2b3cc48b35d57351ccfd600205d1a64190043d4bd1f66
font_01_sfnt_off00015e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E47 21848 bytes
SHA-256: 496f44ec28ba6733889c23cdb4b125996e5cde3c6fcd20df63e51e467abd9dea
font_02_sfnt_off00019803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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