Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b5ce597ffde75b…

MALICIOUS

PDF

85.8 KB Created: 2021-08-10 11:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5420d2cd457d813625e771a03ffbc0ae SHA-1: c9bc5539cf3a239027d3482a9daf279d541079dc SHA-256: 25b5ce597ffde75bb1f3633d738e5ca45cee8b82bf9aa630090d3dfc4b9ce790
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, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/64027829014.pdf In PDF document text
    • http://simkoongschool.com/uploads/editer/files/87271598208.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/tikodukavugofimasel.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c842ca35d---77210008896.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/58955873867.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/ximazabe.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/66707584590.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7bdcec59---bofoxofuzizawemabix.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e2f59443---62302728794.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/parodimupibujuf.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c5d06f94b55bf24cb858e28ba73bb495/66235045142.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/43mq31opalg9nvu0iitjj1ut2o/gelirurevedisinal.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/wakexupebelokekozutir.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tdslnlm5rl1umgo2uqqlar6rn1/63499854536.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b8d6e2953a766b70e5eeb0fa73b7cfe2/mizape.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ov18d763s86k4a8l8o7tvmkiu/radikonafumadofowapid.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/kutofaxof.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/72399508937.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4e9c40a90a5b82b8c3288da1350cf479/20306555865.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/32177421842.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db07446180f---zijofovojutesodopoxani.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5a82dae87f802fdaf2bad9aa672ce17b/podokiwitabot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=new+tamil+movies+at+isaiminiPDF 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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 17932 bytes
SHA-256: c08503c8355bbf47c4164eb76f1a42473c9265bd8063775afbc4214b9dea45d7
font_02_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 10300 bytes
SHA-256: 4647a628860317ec0d30bf525e6f74ef14e28e14b447e8b45965dcd27e866aa4

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