Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c37065d313881d…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 00:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e21af170ee4bc9136a4c352469c4ff80 SHA-1: f8aea766ecb17e05058232b35f0202aeed69df22 SHA-256: f8c37065d313881d51352dddcfd4daf87e5b97604cfff69658bc7fdb3266b7af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host and distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcdda0b901---rejatuvevekurijezotab.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8cd8926289586e12c19ad08ab4d1da05/4418436730.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926f169c17e---95182933091.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/617c2v6sgkov6dokm2b5egv7eu/bixudazo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cgb9oeed4cmvckflce2p97244i/70572131984.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607022005daa4---68078005360.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94a86a643---22687502572.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7e7330b2---67430955674.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/duzolokedi.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/50639645105.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2250d228a6ab668bba7ed1d5d14626a1/wazosoxadizenazavuwa.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/39138121817.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7beb0c4b---90698440435.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ebaac0577---36500238375.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/natenadido.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/81582971979.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/92637277800.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a1c5d1e22ff1edb6f9d0098c93667c6c/gasuxukibafisodamujav.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/589kpnos9n739qkc33toqjo750/29679908834.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/db75224943d1926599978193980a2a08/86174108344.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff4e37da86---6072690121.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/45012530468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=work+breakdown+structure+meansPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 10804 bytes
SHA-256: 3122fd99eb0bb50a6de211121f993546d00d43db1fdb933b746d0ad1af3dbe2f
font_02_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 16084 bytes
SHA-256: c27fafdda185be2695e99106f22849c7304d1d4eff2202c3575f3979fbde09eb
font_03_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 17048 bytes
SHA-256: f7dd01f1d8efeb47dadc26273b8b916c2ade030c5f432f299de8d9520c3329d7

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