Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c6a9e3777bcc3b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 16:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c5679c1fbd24f07c4f3818703b79fff SHA-1: f5161d0d40e6244715633a4367b378d9dd3b8a8e SHA-256: 10c6a9e3777bcc3ba60c704e432ea4807ad79056d4c730acb2899b224e8b3dd6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, directing users to multiple external websites, many of which appear to be compromised WordPress installations. The embedded URLs suggest an attempt to drive traffic or potentially lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=simple+present+tense+practice+worksheet PDF link annotation
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86fa208c15---mekudukirogusikipe.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/35100714635.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161052a59691b6---rumawunenu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/xakajirob.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/xowurutovizomupikesox.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da329abf7e0---99372650429.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/62752349076.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/pukine.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/52037723230.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d676eb8e05a---jugotexiruzonuwoxubu.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/46140996665.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1111c55c5---37644381800.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160761107a2f74---fosolodasidopumuma.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbf25c689---73544213884.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/panabutozurusovubofifi.pdfIn PDF document text
    • http://timebymtm.com/upload/files/55503698482.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/83416321561.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af785a74b4f---47866245383.pdfIn PDF document text
    • http://eichler-kammerer.de/demobujavuwevorofi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608df16da3227---sujiwajopoxuz.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/43bc114adf5cbee45f30db04f2a48bef/23245990251.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/mubasizogegid.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8b5995e88605aa7002bc73fa77c00a26/vameketugimaz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81787e0e54---nisagamudinavoda.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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 10892 bytes
SHA-256: 2f0d8aba23e42c8b6a4d84749602b090b7e0374a117ec85509ff92cd020ad2c9
font_01_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 17640 bytes
SHA-256: aff425c1d03f8f6a48c80aa97d48f68777dc342dfb0b836eaeb251fc04c2559c

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