Malicious PDF — malware analysis report

Static analysis result for SHA-256 535f55e1d6a98cee…

MALICIOUS

PDF

93.3 KB Created: 2021-06-30 00:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 694829236f14275383b5788d8bbfbbb8 SHA-1: 14ab5f856ce89b0ec3ba761861d96254037d9e6a SHA-256: 535f55e1d6a98ceee4a9be849d6eb998f5392a12c0fced1ab576879c31ee5198
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme. No scripts were extracted, but the structure and URL patterns suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/53468251927.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfef28cdf07---40026437020.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/lubapepawezuto.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/s0g5vhbu4ukni16om0r8i8far6/pobixudizixosefebexiw.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a9eebf9c2513b11c76df1f908cc6b57a/15323501231.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608922b0bae47---29680328301.pdfIn PDF document text
    • http://www.centralperdana.com/file/fivibonerulojedijefebula.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/befe97aa47a485cea464c67c90760c3e/xigudedagagizusizemavuw.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/guvufuwawikolojivipe.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/lugiwilaw.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/85049244202.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p89m9it30it77ggsf0ed9jdp71/58251954791.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07baee65da---feruzekejem.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c023738ba63---98823329427.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/pamewetiz.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/timawejup.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/36570583330.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a68ce9681387f6591ad4f044820a1624/xijefupujonazanawavaj.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/37886887185.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504115257183607.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e1e12653---kajejakuruwut.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a898ed7ad1d3280acffdb7de18502dfd/fibopudipogalipemegako.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1qs8ic2gp2d3j3ke1aj95dil45/85149341525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=spider+with+yellow+legs+and+black+bodyPDF 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_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 16816 bytes
SHA-256: a87dca14950ff5a10cd27f4b543821d3950f567c3ccffa369e31248303fc0f8f
font_01_sfnt_off000135c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDD 11300 bytes
SHA-256: fb76fc1d525a6d81ec77ba4aa4856ddefecb00fc02aea86d5186954f26f71ea7

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