Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e283288ffd1e73…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 11:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be6a4ab79e85056a49802c2ea2b5f067 SHA-1: 76a742a4510b8054c8c9b70f4bc1bcdd0bb3c7d6 SHA-256: f0e283288ffd1e738c6d3f199a3b83f0de37b4225b2cd7ac8c8f303e2cb0ca43
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm, likely for SEO poisoning or to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://huntic.ru/uplcv?utm_term=traditional+healer%27s+handbook+pdf PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6af1858985729494cb153fe5147794a1/12240924322.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/8311125413.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/tqu1c6rncesmvb77m4id6jslh9/vifutatuvurinuzipigorovu.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03efbcd4c---87411951439.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/54325997223.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/47407245739.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/90155577922.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/wejigijelamasajepawizura.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/50782147652.pdfIn PDF document text
    • http://chromatographvials.com/d/files/taxusejijomitu.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/mebuvenegilugakipagexo.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/depazejunowigatojoxinida.pdfIn PDF document text
    • https://dineflon.com//files/pexipumetokejetujineb.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1fe2163e---ruxulijomab.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wupasumavetinoniga.pdfIn PDF document text
    • https://reniuved.it/file/nazuweguf.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/sezowakunakedepeveduxux.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0eba24cf49---68102338916.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161148f9e81cad---keramagefotixuze.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/xeterape.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/rujoxuberixob.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/latira.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a25a1891---35590472822.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/32728298335.pdfIn PDF document text
    • 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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 25216 bytes
SHA-256: 0aae178d781a90fa4fcd216102597a4b76a2ebd4fc3714a53f63fa5b5b574c21
font_01_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 10824 bytes
SHA-256: 15a6272e395b280c360a4948a55cb4a13b7cde81f7900c82496f4c302c38fe78
font_02_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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