Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb4a26589ad98ea…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 07:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 38077c353f4516e97d9902a1a4e9ddb9 SHA-1: 98ed66bbf0747eb36ab4b67ec749ef6489525440 SHA-256: 6cb4a26589ad98eae1b1c01bc059eb2be2072e8696ab8586e8ac322a07de6540
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://nvsrolko.org/ckfinder/userfiles/files/90673547107.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e4e25d0a860851429374328a473b4328/vupavabafusevawif.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/2ec48d4d2061c25ce85f8c50b22b5a30/xokaxapaminogumubibegos.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/74066466271.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/tojitofedabel.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b817abe75---gategigozuje.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/gafabarofidekefe.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/nusasarot.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/4246479921.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/86bd6b8bb86d4f1a3af4b08739571760/jitemamufemewepukegidopu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/17e7e5k89hag22pa6u44d0hm92j0qgt6/debip.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/22947915988.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/17553307322.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/19924700859.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4b28a846518bb7cfb5b05bbe61d323a0/sarufuru.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93a0def3d---29747079140.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/46213821721.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e628f41497---wegimopegixapoved.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/75165332794.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/90282816366.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cad14dca2---sadunedot.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/1229041117.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/91702329802.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2k0orqorv1v10qoood0t7ndgqb/sazevurixutebi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/befujoguneginila.pdfIn PDF document text
    • https://plasy.com/uploads/file/kazivamapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=stoichiometry+worksheet+mole+to+mole+calculationsPDF 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_off0000bc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC76 10960 bytes
SHA-256: 19e8792271f2ddeebe3ae6fd02ebc33a2125da539c74940d2cad869ccab3580e
font_01_sfnt_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 17656 bytes
SHA-256: 49b69bba99d28688ebca69894caf30ba2935beb9a6eea28d3bd7ee9740b480d2
font_02_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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