Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd650ffd1ed2a004…

MALICIOUS

PDF

97.5 KB Created: 2021-08-30 18:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72ed3b16225b2f17b9b56f365d3d4f9d SHA-1: 8e3c7dfb221a636861378c837a0dd0708f98c22f SHA-256: cd650ffd1ed2a0045ac0b5516364bfa061fc851b47cc0b6488bd9e5d14b0b565
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is designed to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://catamma.ru/uplcv?utm_term=question+paper+of+diploma+in+mechanical+engineering+4th+sem+pdf PDF link annotation
    • https://santa.my/images/users/00000000/files/75022562975.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/58469551018.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cc68e6de31b---zedelekokoxokilobe.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/meliretug.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109221995095---95524033708.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/77dd72911f545b160fce9cf46485bf70/kipemiluxegagudo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160926a471103a---14369765835.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b63d9e838312168011ad02421ebfa36c/35659305451.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/7127876556.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15784e9040---malaxivezemadeloferede.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/xenixiviwufugikubigonad.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j1fd696htj9aguj2phejnqmg00/waluputiruginije.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/12904090285.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/44289642648.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/wapozosivuxelo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f383dc01c3e---61605777861.pdfIn PDF document text
    • http://ausafe.net/images/art/files/datus.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/28413655256.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/mikanuzinasotebonu.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/97360233552.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/degedugolafuko.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071eefe6f6b5---31902795825.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/vovowowidavolames.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/pekobigevakip.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f56f31ee5e---rujujewewagux.pdfIn PDF document text
    • 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_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 16372 bytes
SHA-256: 3911bccfd68f22c1e71e191850710cb15c0f2f9007ec67f583c1e59508ee36e1
font_01_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 18544 bytes
SHA-256: cbdf56f5a24ed8ee5f495da24edbe24805c0e5cccd1d1dba7401f1da19bd468d
font_02_sfnt_off000144c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDF 11304 bytes
SHA-256: 2f634b3cc2b1c8a4ade773cb5aecc3c473168c238b0e9d2f513de5a67c54a3c1

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