Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a0518ef354adef…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 07:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dc53260cd16d7f820a2f96b238b0d45 SHA-1: 88418509374baae907b3e093605f3aa2c3f2f670 SHA-256: 81a0518ef354adef8c2ed5837104d69b5b39f3a6a5fc1d2dfcd46dd0dff9df04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to phishing or malware download pages, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://homeuu.biz/upload/ckeditor/pages/files/55532253774.pdf In PDF document text
    • http://nacyc.jp/Upload/file/mavopadi.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/615044d8b942d6ce4f7eb88df3d5b27c/fosinotevisejuvan.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/95101974326.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8d2ec741f---82998722675.pdfIn PDF document text
    • http://isgsrl.it/images/file/ramanabadumefeweni.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/46685880143.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/givosotasoxibosazetujipi.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/natelevagewatatadu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ujcknhqsp1gabv8quvnpfke0qh/wolane.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/gepilug.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/sozopogapapik.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/83185800494.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86310375a9---3155926761.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/21886889579.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/qs2ij38684olr986033h3r21b1/53916835381.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc00d7891a---31659858568.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/varitope.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/jikufusirapiligokefuwu.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/vuligovijenoje.pdfIn PDF document text
    • https://wittnebel.dk/file/37529076954.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/sukozatagenixoro.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a5b1c7c2680bc4d3fa5ae652bcae881c/sazuvoxubano.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/46329184429.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/62iiogjbeakc7dbdnbqp6dhthm/39649793067.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/zaxefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dimensions+of+organisational+culture+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_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 11064 bytes
SHA-256: 043aac73da68a2d37ba9fd5dffa8e56da64e97462c0a355ab8aae43ceb216d4b
font_02_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 18440 bytes
SHA-256: 0a5cdbdf3cd42f514bbc59fcab26d90434972a25d91105cf6fa104e21d393772

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