Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e639fe1909c6b0f…

MALICIOUS

PDF

94.8 KB Created: 2021-08-12 05:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 282ad0af840eeb6af543c76f101c75ec SHA-1: 271a0cb00d70f2245803fd0c60c3ca87a033c190 SHA-256: 5e639fe1909c6b0f48606a96585eac6e8df165974599c37ea80c4d0fd23f6144
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing websites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to direct users off-site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=fredie+didier+processo+civil+pdf+vol+1 PDF link annotation
    • http://moristas.com/userfiles/files/rerizupigefurojonuwuluwob.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/pedaxazenaxifagaz.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/35865429161.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zuxarunoja.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/81a09612d44a47b1bca32e81f52aaf76/83766191718.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abcb9068b8---burululudavubusexo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d91fcaadb40bb5ee9b948dd40fabdadf/50358196404.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6694145446---gazunefazofaf.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/86120494342.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703e9420c12---69269421502.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8c47f6c47ced57699f0714f25eea2b1c/53698389051.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/22037906488.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2981957d---dobixuv.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/zabarujupul.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/014755a246bc30ced05bd79ccb733a52/zudirejipeganuwis.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/bd7b5745a1e9b94ac2d5df2e5270cb83/mudesuvorozoxabunax.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210611_063221.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836404e07d---46215429791.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/regoxidabufaxosuvelo.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/fomugafogapawilusedomi.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/18129797698.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/nawikivapibarus.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/velexebamazinizixajunu.pdfIn PDF document text
    • https://sanmall.ru/files/uploads/files/61385249331.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/49087829648.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_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 21608 bytes
SHA-256: c60196a4128c327ec614f5296ec5b93fde8182bff3881a8d6fa0f461e6b1ee6f
font_01_sfnt_off00013be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE3 10344 bytes
SHA-256: 1928fa6a0655e3771917e93572b9a96b4f4372cac39a493f77ee284e62c3bff3
font_02_sfnt_off00015354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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