Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8a2d7ac2816618…

MALICIOUS

PDF

92.0 KB Created: 2021-09-20 02:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e566552b27c80169154af39d457e9eb SHA-1: 6793c827b3d7f7bf1edb642f62a93693ae639d73 SHA-256: 7c8a2d7ac2816618cd61ea8b96e0302433e910ce70d42c586beb677cf891db91
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=new+headway+fourth+edition+workbook+pdf PDF link annotation
    • http://flooroverstock.com/admin/userfiles/file/39161473305.pdfIn PDF document text
    • http://airfa.it/userfiles/file/80592434956.pdfIn PDF document text
    • https://medtek.vn/storage/file/52682131945.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/52703695137.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/vivetuwoduvuwomama.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/63817559069.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614256585dbcf---32678885297.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/491681460613723da6b6e0.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138363407488---73288155418.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/20622031825.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/256185892.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7c90c2cbb944c81fadecc7bd8d7e39f7/defurikuwupinapo.pdfIn PDF document text
    • https://stotex.rs/files/53802477569.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/xiwarewevape.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/28368712873.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/nowepoxa.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/gomuteleki.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/dakarekijazufusedurodi.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/zobanum.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/48308307399.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109061330226569.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/gobaviwuxutexarilelapodi.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/46877083899.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gosevenabaninuzed.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_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10888 bytes
SHA-256: 2afb559cbb94e8df1f3d4559908574541dbbdb31b2f6493f4a300834326c5748
font_01_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 20080 bytes
SHA-256: 3f7c284ca80401a817f970ce47872dba05701dbdf0dadf3017479c8d064fe1c6
font_02_sfnt_off00014a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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