Malicious PDF — malware analysis report

Static analysis result for SHA-256 99030fe1123396b7…

MALICIOUS

PDF

75.7 KB Created: 2021-09-24 11:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e33a4df28409473bd0d8db962413e97 SHA-1: 20ca195e2c9938a7fd5939f8bbfe670c2ea1b194 SHA-256: 99030fe1123396b72374ab45adfc684acad259bb35623af8fb7d4d3d558d8d0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=twilight+watch+online+free+123movies PDF link annotation
    • http://nbmounts.com/userfiles/file/1632119196.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-13-18-33-13-81.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/94487607502.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/79088502795.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/babavomokopafegisep.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/masorizakaretolorojepe.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/50965673011.pdfIn PDF document text
    • http://ha-sine.com/d/files/95031480792.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/vakubidovabaxetudu.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/jugobebawimij.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/jeroribifubosoni.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f4154e174aa57d9c3049756ab5569d0b/91514673988.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/eff69b58c1cae22bcb29163eba27a3f2/muxadox.pdfIn PDF document text
    • http://sciattella.net/images/file/difudalananije.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/36086419602.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/83201500016.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/gagikulepi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d41e91f09f39990f65e3425d97dd7983/99685949502.pdfIn PDF document text
    • http://capital96.com/userfiles/file/55133295180.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/2598826614.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pozununugumafagagop.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ec790aca---zodesebiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C5 11244 bytes
SHA-256: 85b7d5e25f2fbca30f1c2c199eeb4dcb8acac6e3f3a9bb5652e1f7e843c3dc0a
font_01_sfnt_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 16552 bytes
SHA-256: d7f5c06d0ad0581254a8b0d2d381dda4116c57e040831f4738317e15b6d9dc12

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