Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb196c3458c68a01…

MALICIOUS

PDF

89.1 KB Created: 2021-06-30 01:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eb2994fdbc68b4105ac9820550656c83 SHA-1: bf509a5459c14416524b49330a14bf8e5e091141 SHA-256: bb196c3458c68a01098a98df7acf6d9c7ccd2e3fa70bdf6e16964df4f2a7cab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to external URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=rick+and+morty+apk PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/239c5abbb089346fe86f574fc6abefa4/lekez.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3cfa7fdb---6417334641.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a63b9888---69204422327.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/24737730729.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/gulozutadokugakukisug.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3a446139---42911256825.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/skastbpqmjh54sh62n77rcmcdd/40302497175.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a199e200372e208527211ef2a0a37bb5/dafiji.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/59752944302.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/55486375936.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c317a3e93ee---88330569237.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1fe8c19d41739005d00a9675d703734e/xozumof.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/39029675107.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/kojitini.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/73412482717.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-21/images/files/lopifuz.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/napusagiw.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/97598089811.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/42bbd9948c78618ca5d4573f41ed0e58/jagibopixumugegenamur.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/e4iv69gqve9ksmclvp4845bhj3/74690169813.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///78072295610.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/34522100448.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/59373835983.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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 28700 bytes
SHA-256: 48ed287ec823ab1db9531d4dc813e43a0f7e67fd2f38bf364de8f93858fd94c1
font_01_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 10580 bytes
SHA-256: 0c63f8b929212a0d8f647c983b38a45944e4e00e7258b708d541191f1cc26c05
font_02_sfnt_off00013faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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