Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b509eb66dc2fe0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 07:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d75110726c0d97f55f3f6c3b30e0383 SHA-1: dcb88a7a0d72a7ab3edf0303c883851d86957a79 SHA-256: 43b509eb66dc2fe0e57e10d412c93d048da2ff6c774397dfb4fe5b97bac17d84
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/vusawibisezap.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139045a22c35---komovatexepuzeredafu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/85e3ef40bf1e902657f02c15b46bf86d/mifef.pdfIn PDF document text
    • https://ptogel2.com/contents/files/xanuxali.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210909151743.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/70e22699e4c800c614328c8422ae9e0d/wujataduvasekebuze.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/98134692461.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393a7ea61dd---niwofipazigerafipudakuxo.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/retirolefi.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/34452011879.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/43909739479.pdfIn PDF document text
    • http://consade.com/userfiles/file/nidanugoruwesipumofeno.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/fedumixesunujamabiwuzal.pdfIn PDF document text
    • http://ahchala.com/img/file/48778513582.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/61520030831.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/66739296246.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/58015302291.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/88185102209.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613907ae767c9---48952753182.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/59896112814.pdfIn macro / runtime command snippet
    • http://atomleasing.ru/media/File/xisudutotixidex.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161307d5046a03---purejesunuwu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161323bc3d44e7---zakipadozuxigotomapanu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/57399700011.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/83404073388.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/80286684169.pdfIn PDF document text
    • http://www.kindytennisIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=basic+electronics+van+valkenburgh+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_off0000d6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 16768 bytes
SHA-256: 3c926af24e44509b171ca35fe195b73f85b024ae441b1ab5b3669588265b2fd5
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 11352 bytes
SHA-256: 4cc7193529f3af97d6041e7a078c3e482e323ddcd64b25a04b84cee67eb2afef

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