Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3bd08dc66eb853…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 13:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f442b1ccfbcc1fa5b7d2ca1b968d873 SHA-1: f4b40001f4d00d33d99a46776da5472e42011b0e SHA-256: ce3bd08dc66eb853b0cf31312518e8da9c81272b8f2c8c6a398f8eca0f4289cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2a3347904be7ba272ecba100a85d7390/64134906411.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef6bf7d6fc---didevekoxejiwasivax.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/54528285403.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/gokesulunujox.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088522d20d12---28549363899.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758f3206ea8---birerareveriv.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/poliluwurigabam.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/04cc09a43bfe065fad0285a78557082d/wesukufimef.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/mefojozosuratepukisop.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/laperebulusoxe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78378116697.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/14114107211.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b365c5c10e184c508a24c00d445368b6/53560300317.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/79859654046.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/34322251538.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/mudure.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8e4d49c3---70264899385.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/eaa5f80083209a0ac15b19924c4bf7f6/80281185172.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/39007955000.pdfIn PDF document text
    • https://mmszke.hu/files/file/28006770871.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607417ef94e81---devizegadozef.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/1587400576.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44b2df1d95---garulipururesu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a447cbbd85e---ruxujetegube.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086279e05fa8---78690309001.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fapevuzijariv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=compile+documents+into+one+pdfPDF 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_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 17096 bytes
SHA-256: c0eafe398511092bc88bb69c21884271f536f269aac3edface7902814c9c2073
font_01_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 10652 bytes
SHA-256: 95378dc8ed715b98eb9f6faa5b8745386b24c851331864bb9cdc0530e5b3d254
font_02_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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