Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b1564efd281368…

MALICIOUS

PDF

93.7 KB Created: 2021-08-15 01:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7dd7ff4abbf6fa22dde55a2d81fbdb7c SHA-1: a1c1432014fc2156084cda3e8923815f57df3408 SHA-256: c5b1564efd28136876463a57aff14ad594239b9066634c574a8dce7bf355b56f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be SEO manipulation or redirecting users to potentially harmful content through a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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://www.aluvascientific.com/UserFiles/file/wuvajaka.pdf In PDF document text
    • http://pelesiuvalymas.lt/i/File/mofosogijinafiloleje.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f316a6d80---navavegunurejufavu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097b7602ddf7---tadomoporaroluwaz.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wumajalud.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b68088013cc---vabovavaxetukalopoxebij.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152da5db797---vikajokuv.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c88bec688b6---70303263515.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/31933219824.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/23e921b0ef900e142e4029e818a0987a/75008564209.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/p5mf2uf4bi1drv4aevk348dj07/76065280078.pdfIn PDF document text
    • https://aedwea.com/upload/foto/10399818518.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/xakazikavefudugis.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c5e62e44---48450774968.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/53174101397.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/63091220162.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/talemozegi.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/78723917614.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0snvj4hmmt1ac7meb2tppc3ugp/95491465783.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/19965860274.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/1012969360.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/7ffcf330dbc886c53f80f3f16729a6bc/wusomupelugigowo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4392396b54---58943250373.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/pexogov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=insercion+del+musculo+transverso+de+la+narizPDF 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_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 18020 bytes
SHA-256: e14d033a362dac70e8c5aaff3c9d4b8b62eb1cded9e4775ce140114704055a38
font_02_sfnt_off00014d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D98 10708 bytes
SHA-256: 39c95859c3e715d6e070c1de7f60a93458cf464fe60434add69f9efefa252615

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