Malicious PDF — malware analysis report

Static analysis result for SHA-256 951009fd7c88e176…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 17:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22db58dc23c3b956d319e9c0b5e1d0c6 SHA-1: 84f432e00ded5077783bfe84ff6d5bfd791e6935 SHA-256: 951009fd7c88e176fe55f160c5d34166b494f39968b762dfcad39de2b346e45b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to a phishing campaign that leverages link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cfce23f203ad7ef0fea87c726965ce89/pusiz.pdf In PDF document text
    • http://craft-personal.de/userfiles/file/82387589206.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/jifazelodazaxupuxevubewe.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/83708691372.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/94738188912.pdfIn PDF document text
    • http://dongphat.net/upload/files/48215279055.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/82266698652.pdfIn PDF document text
    • https://thietbigas.net/media/files/15561832226.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7739269993.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/52218757632.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/difegojup.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/40765157900.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/43886150460.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/paxazatexugujalalus.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109160425518530.pdfIn PDF document text
    • http://btfa.tw/upload/files/66951633608.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/fiweluzapozigotak.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/wugomulutitedidowikereji.pdfIn PDF document text
    • https://senfina.top/uploads/files/46750427241.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/petasutodufewapuzi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16144b89f89eda---gelibimavutex.pdfIn PDF document text
    • http://didula.com/img/file/jiwazinoboku.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/80146662491.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/abe3da158e655641fa6ecf254587ad62/70392116981.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/xobejosojorogofatodoseda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=emoji+keypad+downloadPDF 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_off0000ca22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 10592 bytes
SHA-256: 529fd36df504104a5f62fb5dbf4e8fedc7b20455c9ae7132f1339da7f2d74fff
font_02_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 16776 bytes
SHA-256: 0b3b060457becaa5bc59df1c97a017d26958d78cc8cd539e644afc7cb96e73c0

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