Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c28119b4a662e3a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 20:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc70c0dd885a3599000aeb1f33937c5a SHA-1: 4e1fcc91ad5cb9f21c6753017bc9856d60f7ea2c SHA-256: 7c28119b4a662e3a6f1c327d35f7717a99ca4b6c1855f0c4e6da1683d6d67031
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or domains that appear to be part of a link farm. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely for phishing or to serve as a distribution point for further malware. The document body is unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gospel-pour-100-voix.com/fichiers/newsletter/file/xanawejoxir.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc2de69295---81608418558.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8248d6a8---vemomisi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ddd0388e86a117f60d27631b40a8842d/11930858489.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/tawani.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074779e20589---kegesenanomijap.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaca7e8473---zokijinapumejezito.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/jilafuzalowinet.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b22951b278b---9712706578.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/lapalekelitijudofukiferu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mce35tst4uuiqbnmk75t8jranu/zibetufuwusudugu.pdfIn PDF document text
    • https://waroproject.com/file/segutasafi.pdfIn PDF document text
    • http://gerocuki.hu/user/file/22805392935.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/meladowelamen.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/58240759042.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0271dea70ac16f230a6f95f0c73ab02b/rakidekegunik.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/bexomulateve.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dea93cdad3---pifiwarujiloraxu.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/51029793713.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ecf96414---39540354451.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/7168561776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=princess+leia+theme+sheet+music+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/rewolutonaxiwinaga.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_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 16916 bytes
SHA-256: 4395eb94b4618a76d05bf79ebc9799d4bc252abbf77230a1caafd58113de4287
font_01_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 10868 bytes
SHA-256: 4d8bf8145b4b2cf9f7fffe2923422ab035d76e1b71b4436e1f712cf5810ef4f9

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