Malicious PDF — malware analysis report

Static analysis result for SHA-256 8794f6e319543cc7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 14:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f75361247126ad9b4eb590bf0f87f72a SHA-1: 68ea08504b25b5181a79f404fb1880be032d53ee SHA-256: 8794f6e319543cc78eb59263ef2cd1d6c72edd4fcbf25b4f36110ca047f1ceb8
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=cs+executive+company+law+case+studies+pdf PDF link annotation
    • https://euinsuti.ro/app/webroot/files/userfiles/files/jikuxobaluberonabu.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/89138126352.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e58db6f66---wetugil.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zelesiv.pdfIn PDF document text
    • http://nemalipics.com/93130043768.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6419c53aa537b2260453bde979dfb3cc/48471846197.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/42b0a2671e658e879a57c75a03e9fe22/5468339347.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a87c902e969f6a3e93e9dde25bce3c93/botatalubawojujijule.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/37156345488.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/73041385989.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///63333913445.pdfIn PDF document text
    • http://acril.ru/ufiles/files/61542331125.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16100d7f13c40d---vikugom.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb029323a3---12178978783.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddfaedca95---32763091750.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/83551168419.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/56195b5bfe7086d482e12d7d415f7607/totizivemarunaz.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/1285046832.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7b28fdc5---23912208291.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/rafesorodosivagug.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/nutamaleme.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/68148946855.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab8f7f4a1---99786147773.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/99487773741.pdfIn PDF document text
    • 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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 11180 bytes
SHA-256: fc2e21d49b180190291d2fdfa96fb561ad75575d92ab6c3fdb74a45d0efc1e4a
font_01_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16468 bytes
SHA-256: 26f2d9a5b0e3a5fa390f51156ec992f285df642c4d2d1316da9932ef0305b537
font_02_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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