Malicious PDF — malware analysis report

Static analysis result for SHA-256 3215b0942fc11c8e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 23:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c84ffc760716974a7c3b6d47e85dad68 SHA-1: 8bc8bbdaebc33cdf64af0c345a897f05effa186c SHA-256: 3215b0942fc11c8e2761fdd6cc11f658ea6cea14b060d71257d77c4ffadf7342
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to disposable hosting and compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=use+phone+as+a+camera+for+pc PDF link annotation
    • http://naphotelbangkok.com/userfiles/files/43800514342.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/73862824815.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/sevema.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3f9eced2---kagoxuko.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/nojed.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/49946987586.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cc81224c---porubagafaregiguwoga.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/gokogedew.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/bazijexopujofoxeze.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/turizife.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gebebofobabusaraku.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96fb416b9---3258431531.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/latar.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/fozamibexiw.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/wanaf.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614076abed355---kimusa.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/kikorawowexir.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/kazatifi.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109021222042257.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/fovefoxegurugivupofop.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/29751909735.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/374c2a13be844eb7308e01700a198dc0/jujorujibuxeviruna.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/5330716646.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/detitirubusodixowi.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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 10516 bytes
SHA-256: f7ea6124ebed2adc20af76189492abcdd662359ee153821cb0455ee24288116b
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 17436 bytes
SHA-256: bb4216260dbeaf1ec05526063d2a84e33f4b575deb7e437f3549b7f972218ba1

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