Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14d4f5473aedce8…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 23:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ffc6be73f911a355070b2593b19ae30 SHA-1: c646151aa1b11cc6222ed39bd9e42fc217bf6f58 SHA-256: d14d4f5473aedce89c4342638b57f3cc2dc3dd2a1cb1b91454a3e1b1ef615e71
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristics suggest this is a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=dialogue+about+travelling PDF link annotation
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/99091917526.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d055c071a0da9a434ed2848e97c50366/zixejexujopinivodiku.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/819554358.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a967896d---74890005209.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/tjth4k0ga2c6i836sn0pgg7igu/mezogozagazotaz.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/djfeeabbh1tj1gucol8ohjrfa2/kasusekegab.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/zizojaziwapel.pdfIn PDF document text
    • http://turbooto.vn/upload/files/19568517294.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/76953040173.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/rerejeranebibonowipaji.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/60284976124.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ac7d66c6---gexudi.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/45564546565.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/72592954539.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa36e09ceb---saralavadokebula.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/1599067676.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/zuzizawawupowulibesapi.pdfIn PDF document text
    • http://lovesenergy.com/file/pinekew.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/31f531360df9a1f39a8a07cfce4555ac/xebifosa.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/kipavuwudipop.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/79897401638.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608243f4dda36---delavuxefoginikuragepego.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c897ccea3---roxuwasokujulitawuw.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/miviwujerelebixadudo.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 18012 bytes
SHA-256: 6b4188cd675a439da144c26f0426f14230cc943761518f8619a2b83f55ed6f29
font_02_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 10420 bytes
SHA-256: efcb319012f818fe08d67df12267f0db4648a2b1b4f0bddccf8e6f3297c4de17

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