Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc6286bced15e20…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 00:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a57a69e94a26cc8bb4664e68d78c022d SHA-1: a54d1088f850e233e98aeec843d70ca18cb45672 SHA-256: 6cc6286bced15e20961e9fbe4e4c0ffa0bd0bb74f4c8fffd115cc266953eacb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=boliy+3600+generator+manual PDF link annotation
    • http://standartbio.com/fckfiles/file/sewulerepuditajisawo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53639ceb6f---wisadavopesan.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/21426660905.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/fuvekoxawawad.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/94519037504.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/73079358115.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c3e9e172a---puwegokalobabosi.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/xogovijeku.pdfIn PDF document text
    • http://turnyras.lt/Files/file/sixagunogoxegezapa.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b0c36f82---95194247527.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/21807808745.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/31602529396.pdfIn PDF document text
    • http://plncse.hu/php_data/file/nolarisupapelugom.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3bqckpsao6cikgeeaejvajec8c/24326622167.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/lurogadowomimixum.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/10717663431.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b4d39bdbc---40312926386.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/wefibirotekese.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/91033190473.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cbfec330d---luxigamube.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/gidoxonaderilonuxik.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3137cdef7f---20616989643.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_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 11012 bytes
SHA-256: f9921c84a23d2207f6e9a1ebae484664781998b3706f7339dbfdc179da049c84
font_02_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 18688 bytes
SHA-256: ab4819052374fa61263974e9ba38151ad76ea192e28009fd38f6027778f4db66