Malicious PDF — malware analysis report

Static analysis result for SHA-256 c119450be4b7a792…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 20:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 846f09d2783cbd4794d12e01c08c93f9 SHA-1: 6572001188bbe38120e94a6c994d817e1a3a8bad SHA-256: c119450be4b7a7922b33b84d14c423f5b50a8533b63026ba10956ff79afe8e89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers or redirecting users to malicious sites. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised or disposable hosting sites, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/65493656561.pdf In PDF document text
    • http://christschoolblr.in/userfiles/file/xejagiwuvevu.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/naxara.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/monupiwonolu.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/modubamevow.pdfIn PDF document text
    • https://coluer.ir/documents/file/89041366285.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/sirena.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf7f4b2d0---85933951024.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xubow.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/97372142624.pdfIn PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/nexexuruvuvipimeloxitap.pdfIn PDF document text
    • https://kawanmto.net/contents//files/begenupagamopezasodajaz.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092241e02ce9---xemadeduziru.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b65d4cd37b---kukokodaxetopipogurix.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160f44fa05c0a5---45904200341.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210601140810392561hi3w0h.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/lapoxevigav.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/vexotuguruzuxoremu.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gabodexefor.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/14935108243.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc0f2698f---14650411559.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/lotulotasefolavinunagidax.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/soguga.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607556db4fb34---91367155108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=harmonised+system+of+survey+and+certification+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_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 11004 bytes
SHA-256: e52684017acdfae384a9a0dfd3e3c71c1a0c4374df0a387147227a60fcf0d1d7
font_01_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 17156 bytes
SHA-256: d48b2b86d91a7f9197e962b01c908318ace920aa54eda0ed31e2fdefb35c305a
font_02_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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