Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eaf5ebfef4b47e0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 15:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0db7c9823a192df8a1b7394676db00ed SHA-1: 9e230e4446aed010f2cdbaacde0ea5015b8af150 SHA-256: 9eaf5ebfef4b47e06bdc25be17989ea15ac2a807c03afb8f92cbb5cd56241b5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bursac.net/userfiles/file/82554007832.pdf In PDF document text
    • https://tanthueviet.vn/img_data/files/58322660159.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf09abc03b---96314954962.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/puvobizasugine.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/71902032225.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/63283664977.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/37513813842.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/87b91c42bb4387fafae08d1817134657/namilerisabugutep.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/moxawobafeniwa.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/44854857793.pdfIn PDF document text
    • http://juentai.com/userfiles/files/dowotopebuxuz.pdfIn PDF document text
    • https://jss-moms.si/upload/File/4657711016.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d35331812f6---38433831837.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0b30acbb0d1a0c8592d1ca04e6bd98d9/75520889159.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/75993941242.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/3343009ba1b30bdf7252435165e72b24/lokuzotamusem.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0bdc7a442---kebepulasedemelatuve.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c21e48c89dea9cdcd1f8e711248af222/sapes.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u3djtqdqbeuvuhjqdf2nm6879l/kapesaberozajekoferar.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/9522032383.pdfIn PDF document text
    • http://timapools.com/uploads/files/15784056597.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/27212974144.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/dufaviwevipewijejuwirere.pdfIn PDF document text
    • http://www.grifin.sk/files/99476409924.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/mobezogisugogezufedum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nelson+principles+of+mathematics+9+solutions+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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 17232 bytes
SHA-256: 7ad7eae338bfa0e57d5157e58a7a2890dee2f9de9fde0e9cf23c99215f50fdf3
font_01_sfnt_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D9 11132 bytes
SHA-256: 8c4f9db9b3d17e1a9e14016e94d73dce4f4370f15dee9b72f75fce8e841d3c38

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