Malicious PDF — malware analysis report

Static analysis result for SHA-256 934489146fa9d487…

MALICIOUS

PDF

89.7 KB Created: 2021-08-14 09:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d794742cdf49c0ccb16793fb5a6d4791 SHA-1: 7b453abd10732b553436db43427a042e48af0b7e SHA-256: 934489146fa9d487a549d0e20e5cdcda370b591b605a866ff3c4f9863b463944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://telenovella-bg.com/files/kubusitajebiruguxepu.pdf In PDF document text
    • http://northmarking.com/userfiles/files/nuwarafegoxadorivazevora.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cbaddddc5---10917034351.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/7464212560.pdfIn PDF document text
    • https://medpressa.ru/files/file/jesafaxogix.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/75077553051.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de836ef10---26705915046.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/kinojisakodoluk.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/dukito.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/53773114733.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b2f36fe5f2cc1307fc3bbf082566b806/2241334348.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/nerenemarawejigukejozukip.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa626abdbf---bovidivakilexabuxa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3e90bad3ecb9940339e14fc53d931e99/tesageme.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021052703472932.pdfIn PDF document text
    • https://coatielectronica.com/files/xefujodezadedegi.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/selobif.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e0328eb22f4accf20497db353a95ac2a/65506926813.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083263ba595b---91891973842.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f105d18129---giweneka.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/gifutuzivikokaxabix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=balanceo+de+ecuaciones+quimicas+por+el+metodo+algebraico+ejemplos+resueltosPDF 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_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 18616 bytes
SHA-256: 112ecae4157897d1a7d2d406e02e461976770d4c7799345becb4c706fad8328b
font_01_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBF 11424 bytes
SHA-256: 18e0e079db4fd96b168f4c677b16d775b5bf2dcd2101e7b11bf094cf7f6dce93

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