Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f969ab0b71fc07…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 14:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ec8d192b3ec157c90ccfe284a13ef2c SHA-1: b886717dd3450b2d322b9d4128253b352e26ae24 SHA-256: 56f969ab0b71fc079a1934ee6ce0dcf9b68bf8f7b1148716ff32056b92385437
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts for links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=convert+kindle+fire+hd+8.9+to+android PDF link annotation
    • https://sweetburden.com/upload/users/files/93668638221.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/xuturozatexulogunu.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/19919326343.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/69114914932.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/wurosuvebonadotoxixubijog.pdfIn PDF document text
    • https://pcetravel.com/files/file/82656716734.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/41871957600.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16134920ce7285---96372424108.pdfIn PDF document text
    • https://il-gusto.com/images/file/fabixepejem.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/muxunexusod.pdfIn PDF document text
    • https://windsbs.biz/files/file/77487813972.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/tofavadoromidotefubavig.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/zulerexujesametavunejet.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/59441734362.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/zewotubuxeke.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/ginikujorafonixu.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/86992820522.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d205c1ce---nikefajejodomexagek.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae65b1ea7sact0ir1u7a5rkv1s/47600313434.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/14677106498.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/tobel.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0g379vkp9b414nokuh0ecnlksg/kagiduvonajawi.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/moforuselijunipuzemi.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/66579108163.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/debubukubugarax.pdfIn PDF document text
    • https://lapdonline.org/file/78474195401.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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 18464 bytes
SHA-256: cf5e906612b0dafbcd46f9de6b8ca4d912cd04998fa5455581daecf3d9c506c5
font_01_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 10912 bytes
SHA-256: 7ac3d105d578d31826734df1a70bd4ed173151338c292f4219f544b0d4e49a43

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