Malicious PDF — malware analysis report

Static analysis result for SHA-256 d927d18a07ab5543…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 15:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ea57e7ddfaa3a58324924d1ed4a5627 SHA-1: 43ac07b53548d451aa81cc664e65bfc3a708f4dc SHA-256: d927d18a07ab5543c4b78d2c6768fbf229e57fa2bc8f083ea8b5a9fe8ba09055
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bc629881615fb40292f50f3012c2fd1d/tofisewusomi.pdf In PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4583a30820974f6094f1a5f0438a0928/61116551390.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xiburis.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5881f343e---57852220931.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/xitajowerazabav.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kunigupokabid.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a8d114d2dfcf43cecd95a74632ce731f/24469169219.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gugomireverabobojito.pdfIn PDF document text
    • http://lamay.de/userfiles/file/sujiralaruziz.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/pufimufosunogasosa.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/s127ljq14elraf2a2ibhf3jg2g/dopowarenoxevev.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/79553883207.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/48407184878.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080643a01ee9---32615297380.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/7516855203.pdfIn PDF document text
    • https://27061010.com/uploads/files/202108161750362002.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/36518606657.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/de044305d2b9340ce4bffe3d2e22c0c3/nenidipidododudusazezu.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/35692582364.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/60583290182.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bad808ea8ba---38766653960.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/kovagurekun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+neural+tube+will+become+thePDF 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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 10616 bytes
SHA-256: 9acdcf6f30a7dd5564e3df35d0d02d4f0aafb73b3f9758838e0d6588968a6f12
font_02_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 16936 bytes
SHA-256: 50c7614b1f4c92a6b64d6bc3877be724e08d3c6184ba72427a843d5ad83e065f

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