Malicious PDF — malware analysis report

Static analysis result for SHA-256 de87a6fe3479b8a9…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 00:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7310d3f70639f85ac54786e3356c9f3a SHA-1: 3ab233166efa24bdd17800f1da700682dd36110e SHA-256: de87a6fe3479b8a952f2f7716f56ff5a2459845a9f703728323b8ae20e37db4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as malicious and by an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the file acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=sicario+2+online+streaming
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/6md96ugpk3u3mrvib5uhok2cdp/ledirasomux.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602182221.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/db709a9deec5a3ed91f10d1288632ac0/nawulogimawetusijixe.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6d5b17b4c24a1cf107f8ed1e229287ee/10615011092.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ee42af8cc087e393d902ff64c5640258/85959871435.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06fc73aca---70424596411.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8f9b513b511cbb42254d3c9b20f80c00/pizadozisinulavi.pdf
    • http://stolizstekla.ru/userfiles/file/xuxoliponugekasomitijusus.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c161929e31175f79e9758b470f37a8c2/62560881260.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c703d9fcc---33883433151.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f22a6cd3a---wumogedomopajevivuz.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e47987c037---55181177659.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00e6b693d---vawijukipozorovi.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/depm5dhtt2arv3p938s397bjol/20369232170.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072224b9a150---96459563410.pdf
    • https://bonacorsi.it/file/voxajuxafozofajosir.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a8f63976---52746891638.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/474bdaa2c8d0c03ae07da92f9f089426/sotosavuwodatagevogomejaf.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8359c3cd5---goresowanezitele.pdf
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/hboeeccfa1v4mfrg1seb9c6dj7/54447795753.pdf
    • http://snsi.jp/image/news_file/kubivazifodafusojiradudu.pdf
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/89502212500.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mv2mcd1sm7ik8hj6kuu3oagg16/pitanovudumeruko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 16792 bytes
font_01_sfnt_off00010b06.bin
94ee45373165729e7e4aa65c82652a85b6d740314fbc886b0b4ea24910c80538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 10768 bytes
font_02_sfnt_off000123d7.bin
bdc254193bc62dd9b9116cf2a879692468edc068e6f3d5675e0e761c728a4a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 17424 bytes

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