Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8d4275f00a8363…

MALICIOUS

PDF

89.5 KB Created: 2021-09-15 16:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 315416e57f40f7e60faa7e7df6d5e465 SHA-1: 16caa7e1514751e528c052c7f8fe961aca36d956 SHA-256: 9a8d4275f00a8363d8e0d804929b9e3ccbdb9a2783f18555b169820dc7073216
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL targets suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://eot.mn/uploads/userfiles/files/rowel.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161404cf935cb9---47767216147.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210915_165236.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/muvojatokes.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/tedusutimivabememom.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/33597417448.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/64627680549.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d53f1db2---88028556088.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/julubokebedegor.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613112bb7cc27---79318912727.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/xawanitup.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309283c7349---76306350738.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/nupekemata.pdfIn PDF document text
    • http://warungmimpishio2.com/contents/files/moluwanos.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021090811355573499.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/dojujazakexoparo.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/10356951496.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa469d47cc---62699660176.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/67558783665.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/60774858803.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/zopijofumisiwarujifafaj.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63176536048.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wewilodibixubope.pdfIn PDF document text
    • http://printsolutions.printsolutions.bg/uploads/wysiwyg/files/mewos.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/51911886768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=machine+learning+book+pdf+free+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_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 10944 bytes
SHA-256: 60b569c8d10f5a4cd5bcf3d50bbfb7be0e182612e5ddc9fa03a57f6dc6357ac0
font_02_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 19936 bytes
SHA-256: 9ade8404e472f9465d9f271c1553f938f112e045a4aba9a799874ad2e20e9637

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