Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef5c75e700a9233…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 10:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 47bb84a2cb476b11181253512c9462e6 SHA-1: 7497182560150e27f75d44969cf8f21dd336498f SHA-256: 8ef5c75e700a9233f23d0e3c4e66625e11ebe61160489ffe70bcc3e8f570cdae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to be a link farm on disposable hosting, further supporting the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://drafthe.ru/uplcv?utm_term=types+of+control+valves+ppt PDF link annotation
    • http://blpest.com/UserFiles/file/68552849619.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/55072335778.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/b2ph694njvbmn8ballq1qgl87n/74770964867.pdfIn PDF document text
    • http://paliukenas.lt/i/File/wegajefagiwebudon.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/jaxin.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160970826c8a53---69686815262.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/sipanorikoxuv.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/xetov.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077718108502---7070316593.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fkk26k7b448lkgokt1f13npam7/23730632516.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707daf1cb32---18034742246.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/ribibisivudezegivafumax.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd66e5988---ludafujadanageg.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/59495064464.pdfIn PDF document text
    • https://resicolor.com/upload/files/sizodalise.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb10202d4d---gudavivutudagigupududed.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/1173965983.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d032107556---6443051695.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/53278062558.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d239839b18---27630326444.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c7d25e4f3c812148d432698a8c9d897a/74325162253.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f5acfae8ead---lavezakudakuf.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/30177456113.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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 18440 bytes
SHA-256: 8ef7540825d5cf9c0a4a1a3d346c260a678c8bcc6e902120d31b852e0970c6b5
font_01_sfnt_off00011cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13505 10524 bytes
SHA-256: 5d047eb456711d1aaa42e9b91361697e5b131d31ab2f801684afb8e191bda0a4

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