Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6564ff478e3304…

MALICIOUS

PDF

98.9 KB Created: 2021-08-19 12:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b93c94a0713f6107308fadb9b4c2b879 SHA-1: 31f09dcfb2b00ac8154b7133b1382e8b4a72973a SHA-256: 6d6564ff478e3304a758b31c468148540bc3aa7d1218d69848837061ba9eea7b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload via the embedded URLs. No scripts were extracted, but the heuristic firings and URL patterns are sufficient to assess the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbef7f41ff---50756027361.pdf In PDF document text
    • https://renetravel.ro/images/files/mezixapegagaverusibolufa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607661ebbd7b0---61320656980.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/62153918664.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/92098825233.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///23674303520.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tmci00gq8ef2h7nrl6cb22o4mb/26755188562.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884705951e2---23989021223.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097f5302dda4---98087022440.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aca4cfcbde3---jizefimogarepaxoxokapug.pdfIn PDF document text
    • https://stvorki.ru/files/file/famawupuzerer.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/situl.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/durefivozowixideperakaru.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/9562e3d1fd0486f3ad7e91bc06ba781a/kinowobakazebidu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907e34a8923---mogetod.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4140c669f---63484455031.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/26581893515.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaacc35a0e7---44428056016.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6395032650d0682a855dc99b9203b1f0/90268206049.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070c66c804e2---zezewepelipulufidezagu.pdfIn PDF document text
    • https://hgb.se/filer/file/87722502438.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/tubirizodud.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/kufixebogagikuzuv.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/89705af1a165da08785e2bd35f3c9dc7/xeveboradadutegilixozidal.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608557ef1c0e4---kuxatuvebinodoxafakixoke.pdfIn PDF document text
    • https://medius.sk/userfiles/file/besamu.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/78451267603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=resolucion+de+triangulos+oblicuangulos+onlinePDF 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_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 19556 bytes
SHA-256: be9e253c487ca5e774a932e463724a3b76e3fec1e75c391a8f323896757b236d
font_01_sfnt_off00014a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A36 10828 bytes
SHA-256: 6e7a2c29360917266a437bff95a850450e48ac03fb424496d6811789eafbca46
font_02_sfnt_off0001631a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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