Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ded25756d9a47b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 01:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0c4202c26b36f8c9d3c0a4ab9329114 SHA-1: 168e5464d51c3aec4830239b5551925e0d850e82 SHA-256: 90ded25756d9a47bd3255048be4e598d22535f0ae38e958f55f17c090f5fe499
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is likely used for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://avonsteel.com/UserFiles/file/xabuzamuxosefamidike.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/77fbb302dce5f34b1b6619be3108a2fb/87677770712.pdfIn PDF document text
    • http://gdgom.com/upload/file/210622195026423524ia5o6r18t3hk.pdfIn PDF document text
    • https://arerp.kr/data/file///85279403778.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ec563e302679ca7f4ca3e304ddd344ea/36560979621.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1d136abc0a2da4223056ee9e9f5bca2c/93286553900.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160966f56a19a5---zujesoxifukan.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/88285684989.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/34272298282.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb99f09e561e270d33232b253d26300c/40151876264.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/pipepoji.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0586b1a3f5---13493470668.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/29947325410.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/jisow.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/66113831970.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b81985a5c---liteb.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/prbfamtr3gt6k6begeqg89skdp/96004716081.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/zagif.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/parexadeweli.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3170926ff24cf9b8a0c02e224be8054a/limabemofofup.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607662bc9c282---93316784181.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/a5sh44mpo772gc66nl5tth2ukg/jureguvujimimeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lucky+patcher+noPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00013d5e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D5E 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 21716 bytes
SHA-256: 052319d2cf7e4b0f05f87808916e9e4d6efd4b635ef8f68cb9ba05b2dd1a4b42
font_01_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 10428 bytes
SHA-256: 6263fe4ad9c28114444e8139b23f6af68bf7ff29f96bf72bf049269f98226d2c

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