Malicious PDF — malware analysis report

Static analysis result for SHA-256 c352534be289cbdc…

MALICIOUS

PDF

82.4 KB Created: 2021-06-26 04:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e411a1853902ef48b234dfb0d9b2b60 SHA-1: 47da171b6134b8a4afcbc2e7ad5260d66f27ba2f SHA-256: c352534be289cbdc629d24bedb5418c8ef3ceeda52f8c0dd80ad4df8fa5379c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The 'Remote-support tool lure' heuristic indicates the document likely attempts to trick the user into installing or running remote access software. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious content, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://stallion-international.com/userfiles/file/55116230727.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a01f0036---33324778578.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a982a97af2e---mogefijonazomu.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/19392019685.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/17048006530.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f4fe53794f27ac4e3f1031b1f5cb39d9/vagemukavekexokizewaba.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4sh629ae8fu2cp8rumj4v9dno6/peweweruwekakukinar.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/95189109811.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4019b639---rivikavekotageju.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/28973202493.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/98386d09cba1b89970d7432c45770d8b/fugolowe.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23105c0c1---zabotew.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/donenajevaretejovuv.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/gggrovqac8boskp2vpfat36p71/93096391527.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160899e32b9816---46223460827.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e033fd2a2b82cf8b0feee254d7cb76b8/21783133323.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/80475936643.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f30a2eb2b0---napukozuroxosixapubawikaf.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6ad50e1c5---55471687036.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/71a4d3f0dd27b5bf71b48c91fa65825f/58134255230.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9972ba53e71158643d22ca4dd7ed824b/dopezogoxokimotovanof.pdfIn PDF document text
    • https://koratspring.com/upload/file/sonew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=flashback+in+the+outsidersPDF 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_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 17196 bytes
SHA-256: c6dc43016f520f80c9f7e4f5907f2c7bdfe9b78ea6a068ba0f8af427a2152b06
font_02_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 10776 bytes
SHA-256: 4d2b442f16eacfb935074fda839a9c63d1b1162ebaacad525f13516a823c1e4b

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