Malicious PDF — malware analysis report

Static analysis result for SHA-256 97254a3909c84b2f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 06:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93487f3a0f1bb59c01a7f4baf5c3575c SHA-1: 9be752bbe9558497a09ce94eedb72842a5e48342 SHA-256: 97254a3909c84b2f5611b9dd5ffc60a542f6741520f71cc96e9f5c9e336b1c67
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to potentially malicious or SEO-abused websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9731c5325bab19ae9bff8dd89673c310/kenuga.pdf In PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/12902437304.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/99593671625.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/xodiripik.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/mufolimajojabubovawo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2fede1c84---25132874892.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/redinobumava.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/3910938890.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/6140074903.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/gogakaripozinirabo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/mitinofajijopelirafer.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16132117aade30---23815004319.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/ditatizo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc355fec0---82127385638.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d8fab365fbf6519cdf5d699fb57ccf3c/5360234589.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/21445724168.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16111a6f8e25db---72965794591.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/b85a203ec1091fc077cfc74d35c3b969/romakixavulu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4805d098---jevoderomamorumugokij.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607727746078a---44972249986.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5cf973ce---nujuziluwiwalowubefi.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/47253623378.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/64222330749.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/fb1ef15947e5f3057007135219af4fff/43198777761.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021060216071794.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa5f89504---kasaraza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manual+honda+ridgeline+2006+espa%C3%B1olPDF 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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 17504 bytes
SHA-256: 64a1711a2f088b6039d9f1d8f90e8ce9e48cfcfb0352a24ad1e105cc0f2130a3
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 11284 bytes
SHA-256: b0f7697971107c1029b5372655d57e27ea506d590e075ff134d3f7e221070461