Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac948a547ded719e…

MALICIOUS

PDF

82.9 KB Created: 2021-07-16 08:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39502d8cf96e167c00ba4317152f36a6 SHA-1: dd3fee942642b661ea4516afac5b0afba941a62d SHA-256: ac948a547ded719e58a95f86d78773c2645fcecd8f410e8dcc6696384071457a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites, likely intended to host phishing pages or further malware. The presence of external URIs and link farm heuristics indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

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://queure.ru/uplcv?utm_term=ding+a+dong+eurovision+1975 PDF link annotation
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25884237e---duwilemekumedodiruwigivir.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3d66dcff---88317154517.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/pmuab11u3ch245phiad82hh8v2/2466586535.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6a8032f8d8ff832a2420fddc50fa7c67/75988616837.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/70970673897.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160745b37da051---bakenagefivevolugamoxab.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/60774001247.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/68571427014.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/6214747986.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752c3582fa6---67785122126.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ciqsgti4llnegom248j3spbeq1/51695764752.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/titasoligifixopiwu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1abfe1cdc---vafejeman.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11ae6ccae---zikuwar.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc4d85bf8---27236717910.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e02f581bf---92513312046.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c4d8ea0e102b91464f7d5c103a36a790/melus.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/zavimebitizuvozexexo.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/50897261890.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cecf9f73c---jofegixezeposawol.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/bimodut.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/lumerogazidibelolewumuj.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/37443617147.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ios3tj8nemeumtjiedib8ru7hj/bozodiwuvoxome.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/13634a56be98237d125319b40079c10e/lanofowimanufajimaf.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/u0flkmnj9cr31olejf6c5cs225/60340290883.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/giviregiwawuro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 17508 bytes
SHA-256: f7f56a1ffb40f3516fe6dfd027598561eaad282311538f217a53ec0d342d922b
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 10852 bytes
SHA-256: c707a83eba2c59dd14411b229a49f9afb494adc27b120a3dfd0bad6b925d565a
font_02_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f

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