Malicious PDF — malware analysis report

Static analysis result for SHA-256 385a1cf2468f68da…

MALICIOUS

PDF

96.4 KB Created: 2021-09-02 15:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1190363f0efd99690cc97ded02a46840 SHA-1: 426a91e08cbb7ac83b60a74253b12380c43ed362 SHA-256: 385a1cf2468f68da673479bf7bd223541eb66a39ca625be22d7bce40c0979577
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://daismene.it/file/86967243861.pdf In PDF document text
    • http://sjanzee.nl/file/zupifezajubemowiloj.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/7341743429.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/safenewopuziki.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/255d3d78e38b544cdd9f413cb89d3a49/jotifowi.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/majagusepuxobiniwat.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd2152e13---30813570528.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/76428dc8f4d9338ef08a79b417a35a57/petelu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e3f002445dde14db20e2bd18be78f821/999515059.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/gipgh792pv17g620tptp7maaf7/46343347648.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zulovudesiri.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/wunumo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92f71a62b---ruxifola.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/rekelag.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d6a05198---41721976647.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa178fa6405---reteviwivolinenanakifelon.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/f44a4ebd86cb51bcb7c447144aa4a8a9/megusabipasukin.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/pezaxeleji.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210627131210.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d801a28f66e67f01f77ea6295e71e33c/zodorisofe.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d823760b1---subopivanuwibanax.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/sifaku.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xenesebimojifokosupaka.pdfIn PDF document text
    • http://ipceurope.com/assets/file/11558993413.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/88693875642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sample+of+teacher+application+letter+pdfPDF 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_off000114e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 17804 bytes
SHA-256: 1be956590991ea3e4ff69f8f967936de11e5e343b5512f1b4ac9fd4bbac7b0aa
font_01_sfnt_off0001435b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435B 10792 bytes
SHA-256: eec3b945de8510f7e77d5b5c6f5d2bf6b983a2da93a0f743e633ac6e83ec1dac
font_02_sfnt_off00015bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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