Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98e46276cdc34b2…

MALICIOUS

PDF

130.3 KB Created: 2021-07-18 04:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0af97696ca3ceb4028f7afc5ac8e3da2 SHA-1: bd8e8529836bf4f504c469bfa28e67818482f499 SHA-256: a98e46276cdc34b25f171abec007b723530ff53ea1e1741cb260c2841eb6b7c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing site or malware download server. The ML_NYX_PDF_MALICIOUS heuristic firing with a score of 0.994387 strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160765e166fc1f---35794603848.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/veeduf2rtc6sverquc68jbh234/fitikowulogugizodofubesor.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b63719a8889---18925416302.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/jononilorem.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/wezejiboso.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/julipalile.pdfIn PDF document text
    • http://servmed.net/userfiles/file/24964346337.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9fc6e1abd---liminonoda.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160972aad04618---87610954979.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c652aa4be91---34069128523.pdfIn PDF document text
    • http://turatabor.hu/media/15315816105.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/49032328774.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/de7bc48900afa0ec4c6baae40b69234e/kuzejodomorawazorev.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/48712079147.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/99353144550.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/mcmmhcufm3hdqlm3phjca96qs6/12676978557.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67080deafe---60868499624.pdfIn PDF document text
    • https://emmaushuis.org/pages/fabifilijebosopix.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ab2cf120---gobavududabibezo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3dfeb1c4---bogumetapufigegosif.pdfIn PDF document text
    • http://bjjiffy.com/upload/75853760461.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/80452042dd288b29aa7e6f77100ea8e8/66672460497.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb9db93d27---91250570172.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8000f435---90152945513.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b41b74002b26537913ecf69f1727ed12/bugowuximodotarexul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=public+goods+non+excludable+and+nonrivalPDF 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_off0001989e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1989E 18568 bytes
SHA-256: 5c4e80ff44c42043545e9c900d38ca689e0d1c956d56e04ad8c601e0e65d6ef2
font_01_sfnt_off0001ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA31 10856 bytes
SHA-256: 2514b3610f388bedceb2c5610b5f605bb54b840a563cae08e6143f75f664d881
font_02_sfnt_off0001e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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