Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af0f14316ff9191…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 09:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 268a33b6527c8300b0ae6df7eab70ddb SHA-1: fdad3d1d3bc123216f32a12f977407278b428323 SHA-256: 9af0f14316ff91912c19bb3ffd7b28191ca15147a2805398ff2094029a5db864
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF exhibits multiple indicators of malicious activity, including malformed streams and a link farm pointing to compromised hosting. The presence of numerous external URIs, many hosted on potentially disposable domains or compromised CMS uploads, suggests an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://eternoohydro.com/d/files/50915697917.pdf In PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/fojoris.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161369bf62b0f2---pewobojipodilowejofowef.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/28487198087.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/sulegugaxorogosuf.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147353aee01b---40077813255.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4e4406b82---paneraguloredusumonejana.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c4047738---refonefelonixob.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kovujolere.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/10319664386.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2111865796.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/jisubisalinopesimowunafef.pdfIn PDF document text
    • http://dgjst.com/upfile/file/tafoludufu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/fatuja.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/bipijutudad.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/kinelipuwele.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/32703845719.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/49183985921.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/81518633119.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613f11e094be1---53009246519.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161416256b2ff7---67846091990.pdfIn PDF document text
    • https://wonkingchina.com/d/files/16003548160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=instube+apk+download+old+versionPDF 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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 19348 bytes
SHA-256: bc62e351ac5addf3d89057064e6af9ed8d3a2b0dd3c78e54d21116873d288c4e
font_01_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D51 10820 bytes
SHA-256: 2a93de5dfd229bcaaa99da35934e9bbac0e7cc1b8a918e2d45e3cbd13cb45db8

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