Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1a024b0c211d0a…

MALICIOUS

PDF

88.6 KB Created: 2021-08-09 00:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6218026959ed09ad40406becdf15f05 SHA-1: 31226ba49f64988c3ece4efa42c591cd7b9bbecd SHA-256: 5a1a024b0c211d0ac33461e8c23ee4c405fcaee7e7fab20555bef14f5e06d63c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. Several of these links point to compromised CMS upload directories or disposable hosting, suggesting a malicious intent to host phishing content or distribute further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fimovuritozelipukibege.pdf In PDF document text
    • http://globalbando.com/DATA/upload/files/202106230146071944.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d76f24e03d850e32c1c1254a02fa1f8/luditule.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/95621205974.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210804223848.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/noxidifa.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b376011cb7d4d19d1b83c9a38c875671/kewezovigebukuworozaki.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6f0090df14e84442a45977c8c5e6215/warowumagiduwizali.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/neperipegixabinekilo.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/13499621125.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/654f6f631a9b41376cdf87183f84fb7a/xodokavu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b4d038d8---11751589572.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/dfdc259d8f21b5c8d2017a7d45128448/35864259651.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/xewuk.pdfIn PDF document text
    • http://rts-3.ru/upload/files/21111939703.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b310085efac---zojakisawuvuxeb.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/dirugu.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/gewuz.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jj56go4lvlcmlrmgk6h32g4id5/zefapex.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed59d22adf---79240266192.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad309ca401a---45912652849.pdfIn PDF document text
    • http://apcmagon.com/userfiles/xozewijowibikufemanivopo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6cjfuprobo909ldpurngeimhp2/xumexovipererif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cazadores+de+sombras+ciudad+de+ceniza+resumen+por+capitulosPDF 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_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 17992 bytes
SHA-256: ab852d9e2a76d3f18eb64ee5f0f2f3b262bfc228ab5ff1a454f32d041641fb2e
font_02_sfnt_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 11004 bytes
SHA-256: 81f72a48a9b613a9ef9761f8052491178559d80f24a1b497b16b0493922e4bab

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