Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3c825958290736…

MALICIOUS

PDF

93.9 KB Created: 2021-08-07 08:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dd5a89ea43966f7f88d99a294485f957 SHA-1: 0db4367db200f1c05ea6ea6bb1b12e3dd20f645a SHA-256: 5e3c825958290736aeb1fbe84b67de5c32967eacc6a9f47b2e3dbc13ea6ee666
156 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 a link farm pointing to multiple compromised WordPress sites and other domains, likely intended to host phishing content. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious websites, aligning with phishing and malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=divisiones+dos+cifras+cuarto+primaria PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pofci39iu8fllb24prolk42ce4/48580065670.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/412897c4a3df8d86126c6dbfe62d2acb/45756683642.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0ac6cb40---37844897215.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084a72a1dba2---sosadalumitosiperuvibegak.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qjhv683tefjtf4m1atga9876rp/83147429348.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210529055111.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1098114f9---14428660234.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/dekovurawoma.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160990f495f236---67118499332.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e218e2c06960971853b7aae79fea107d/52787316241.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/67864841402.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609774d43f080---devugizatawegaz.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zesipibinavub.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/84775294597.pdfIn PDF document text
    • http://potlista.com/file/files/kapozinojemonumuve.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/sivuzovasomusawos.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/11r76v795gog2dtv4mo7m41c15/46790253786.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8360f94405---18498982061.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/fibosikozez.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/kawilefuwoxaj.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/ginik.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/kagolititabaliv.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_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 18248 bytes
SHA-256: a71c58d1032afe6e629cb5d0b508bb242e1713b4fe1aa0885b74b172a3bc22b2
font_02_sfnt_off00014f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1C 10904 bytes
SHA-256: 38bbd0804fe0b69ac83932530465c9b3cff0f57d7470841299ef0816848a35cd

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