Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7f3ecc3ed4fa64…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 05:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8df9f7d2525e4e012e033271a3241b9 SHA-1: d8622ec3c4d8a7b81d8126faa870ad12a173c883 SHA-256: 6e7f3ecc3ed4fa64f6ba90730f66b52c91565b29686c05a687a2d0482ffa9c19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, some pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://cructi.ru/uplcv?utm_term=car+modification+software+for+android PDF link annotation
    • https://jordan.si/dokumenti/file/masurulikisofafesatoga.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/21637643706.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/ludabazenewara.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5967fc0f---zetijawowu.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/44527089129.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/novilupukusezixuvosija.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c630e3b4f---tujufozidemuruboretomaja.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/walalufesomixulofulexase.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/xoputejapakukakimajoruxu.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/90501695377.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5mv6bpjnvkphnufrb1us235aa2/zemafobuxuvovitojidojidus.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/26834789342.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/54866238188.pdfIn PDF document text
    • https://invest.pl/userfiles/file/mibagizajujifutafa.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/92328453535.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/46569929671.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614217a40ced7---18841403499.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210924_FF4749EF38CF095E.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/gazosawukozofife.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2da1549d---20284507839.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/mevofegugisamofidileramo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c324a9515---savidetegozamak.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd2f50616---75355876191.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/dekokelaterat.pdfIn PDF document text
    • https://zzwgjx.com/d/files/kopulugixujena.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161403f275339e---41267075793.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_off0000b60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 10708 bytes
SHA-256: f55463a7b726972cf2a1795f7b82f3f27ca07c3072d615ae3ea019619c893bbe
font_01_sfnt_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 15096 bytes
SHA-256: 77001e5de0a7b6c41b3708473124e4df54b9303b6da0af119db995252806694e
font_02_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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