Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e274cadb96344b4…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 10:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15799f81e7974b2c5230437760ebd696 SHA-1: faab2d47e495c2b35d57406f753eaa6b35999691 SHA-256: 8e274cadb96344b4dc003dbc43b4c8db5762cfac661eeba01b5967d6b8d0b907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://greenearthgardens.org/userfiles/76538848504.pdf In PDF document text
    • https://artenika.pl/fck/file/kureku.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/32094263630.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/risigepuxiw.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4477e5bef---pirizutubemexunixerasal.pdfIn PDF document text
    • https://soechi.com/userfiles/file/pibolade.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/tusikosuxajafafemutapum.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/tilosilunisavakekezuge.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/835354eee324b3a9cdf5e1ae17ae1803/mekagoromenunanibumabuj.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d2d447d28---xivedixixidit.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/utgu3u0v4oo6jk51agm27n12g0/lasunojukifowewutukedov.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f149260687eb978b30c49878384aea7/wexanabotanoz.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/98787217560.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/356f108df53c5b6f6422e051d490dd41/9418319124.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffa82de4e---pikukunozudexupu.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/34041317703.pdfIn PDF document text
    • http://all-premium.com/user_file/files/sofojemunelagimasa.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/87187901793.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/kebofanopofepozok.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12d5aaa4c---doxamomones.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/lazaporek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=statistical+analysis+in+research+methodology+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_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 18680 bytes
SHA-256: 328c34ed58a7e4aa85eab8b787893a9e13196d503b6b6ea544f6d0cf93f619fb
font_01_sfnt_off000120a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 11256 bytes
SHA-256: 722aeadbf841bdeb1b0ac702f5e809c5431a7490eb767b5e02024b561423d10f
font_02_sfnt_off00013a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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