Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f39ff1a157e06f1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 22:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f4952fcb9b9baba0e1598beb800b04f SHA-1: 42c454633f7593aa27cb01fb356e6b5498d2988a SHA-256: 6f39ff1a157e06f1b18b480322487b30f8034c09a67f3297935b44b83442dfe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=communication+system+pdf+download PDF link annotation
    • http://jeyadhurgatemple.com/userfiles/file/watasavaredojimolopef.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc3df5e71f---kuvamipijibapigusukotofev.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/80643365803.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ae101a7fd442fdc903e6f132e69f73b8/farobedanub.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/4630112115.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5d1fb30b88da1dbe73f4ef494aab2bb4/45652618667.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/52310131110.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-7/20210807131329183307.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/ritesekeped.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/31101289177.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/19188443914.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/87308226426.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e22e95ba89f---roguvabevawekaxomadab.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/81855048750.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/61db3f780133b4873b9f2c96a16bef9c/sobuv.pdfIn PDF document text
    • http://poiskvod.ru/images/file/vetoxinoverukitumin.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/92298850277.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5a064316---67245931398.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24181b26fb---62686790126.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/36vsbfvkr2p7t269ldgpi3vje7/96333517178.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/kokamuketapiso.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b3187c6269c1cf1fdf664ba527fee337/66476826858.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a8ac7560ec7d806ae55d1ad30993629/bolerogulukobaja.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/muxepekejugifoda.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/18471565016.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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 19628 bytes
SHA-256: 7e850b7cdd9cc9c39a708dfde3d19ca5437e05928955ae6e6c331433bf0f82fc
font_01_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 11012 bytes
SHA-256: 8635b523842874129acd422eeb7d6ecf04d6092233fc0e55d9bd4f3d9ff1847d
font_02_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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