Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e242105687ae315…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 20:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01c20f0261eb273bca67a80c95079b5f SHA-1: f60c18beac24920af0f7621089c8e079feed4bd2 SHA-256: 4e242105687ae315b9fac13df8c1428808705ed2f42945c6cd01e057f753c7eb
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest the document is designed to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://magicdiscoradio.hu/userfiles/file/75583765636.pdf In PDF document text
    • http://royalrep.com/userfiles/files/9265905083.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd07d4937---belulitiragogerijuwine.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/84034193002.pdfIn PDF document text
    • https://medius.sk/userfiles/file/65992927453.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/19010478526.pdfIn PDF document text
    • http://www.moyekolodin.com/files/1725108879.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/wanizajifijinexidujurida.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07e69881f---19003813425.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e937cb41e53---57951608373.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/piwugobawe.pdfIn PDF document text
    • http://nktrading.qa/file/files/69573787124.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/41778848340.pdfIn PDF document text
    • http://skinanniversarymall.com/userfiles/file/23336582724.pdfIn PDF document text
    • https://songhong.info/userfiles/file/8617984919.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/68473102278.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5ab41214---gazedudixigomugoxo.pdfIn PDF document text
    • https://tl-systems.hu/files/files/77812416913.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/tipodajazulid.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4df48e5ab0df160d9e28a535c5fe3d1/79921486853.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/sabamulalituxowa.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b29ff04e8f8b61a03394b79e3e14547d/zurob.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/62fbb85e69288d9d3d7665d3ffd4118f/gasafuvuwoviz.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ffc9c85c81aa197243456e70e1113903/kodirogogimoxuxo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b5686348---79376749027.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/duzixonaped.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/j8okdnnl9gnifshj93s2m528n0/muvem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=reproductive+health+problems+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_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 11132 bytes
SHA-256: edb12fd9f8202120ce4e10395eba1f415e7a326a1c3c87ce0271ee719ff29c83
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 17092 bytes
SHA-256: 18bf695f8c44c2e624fb2ac99a742471ac25ce99152b3b427deda5758b6932b9