Malicious PDF — malware analysis report

Static analysis result for SHA-256 340e52a025915d6f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 10:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08cbba8b1217d08ea4f9be83259f7658 SHA-1: 58a777f7474aa71ba2b823d02a562e41a7530439 SHA-256: 340e52a025915d6fcbf2a2b0ead54a2567808b39132777db4912c564119d606a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864806764f8---zabodesafe.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/jugiv.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/87169435862.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5069ade65---babifuvagerapeluf.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/8f361087c79b14824a49f3eb83bc482e/fisulonepunegigujakejuge.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/jivaxukuked.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/90130490757.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e07c2997c6---69839434032.pdfIn PDF document text
    • http://aimic.com/userfiles/file/77478601966.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/94832956973.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/bujokur.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/65466569257.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nijego.pdfIn PDF document text
    • http://maihome.hu/admin1/file/bupadufulafudel.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/69680047727.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/95848564681.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/1678348623.pdfIn PDF document text
    • http://superpart.com/files/38767069463.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/pepudafosigovumij.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/sawusekivovufomitirukuw.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/44820ef9ce1933d907a01963ca1f3af3/29798242979.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de6c1025735---pexazuwukaxatej.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839629879a4---jixaxumeg.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zalovediwevakuluj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c92d284a1a2925c232e5732cca46908/nopirufobetatonerotuzi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc6d828d4---79585894227.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/ginufofasewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=red+trofica+marina+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_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 17616 bytes
SHA-256: baa2d503b0e83e81080bfc11cc897bac10667c7f56a6392fb7bd71d07efe82a8
font_02_sfnt_off00011732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11732 10612 bytes
SHA-256: 189c9847f1b8ee20a9d5a82d184245ccc82b5a534cb83c65b18642a6129f7ac4

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