Malicious PDF — malware analysis report

Static analysis result for SHA-256 539fba663939b989…

MALICIOUS

PDF

74.8 KB Created: 2021-07-01 12:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed1585b8fb7e6efbef9df019ec0dd337 SHA-1: 1fbe3b5fb2e42f1f1bc2c62df0384a4aeb17625e SHA-256: 539fba663939b989c7b6c3d9b028c7ee3f660bd5800f7dc01e27b436475654ed
94 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 compromised WordPress upload directories, indicating a tactic to host malicious files or redirect users to phishing sites. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the structure and URL patterns suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7568

Heuristics 4

  • 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
  • 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://smidgel.ru/uplcv?utm_term=mphil+in+physical+education PDF link annotation
    • http://galluccifaibano.it/userfiles/file/gafedomozepito.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086711741190---40904818139.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8d792ce5---42855472446.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe436825b---kiroxisaru.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56156b3b5---69513633210.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3bd855a99360f42facc70cb75f8fb9ab/75168752003.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/bd93b3e0c49cb6641c5c94e066776d8c/fativom.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d1cf760253877578d7bce16ed4c0991d/fimev.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/71462952412.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jdgnjp5b8vuga7tjkl4o73d395/90773320195.pdfIn PDF document text
    • https://mytopics.it/uploads/file/jivujapeje.pdfIn PDF document text
    • https://kuepancong.com/contents//files/21015196560.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b412d8b1c21---mexodoletumelifimopat.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16089633a89acb---rafifelatotajixexaj.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1c324bcc3b5b1b039279468f1262b441/59111049747.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/rujuzin.pdfIn PDF document text
    • https://aashianarealty.com/file/55749998618.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3514c7214e---buvelukabepedegugumogu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c9b8c2eb---zopewifixijomozikilopuse.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504140859166155990.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/pupetulivulexonegowi.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843204ae2cf---xenalagirezapufejo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a48ac1ac---55565065291.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 17440 bytes
SHA-256: 2c2e5a74e523dc64d677d2ef68d71a348b49d4a1c2ca1699dac2561f015870c3

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