Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6304e88bca28b4…

MALICIOUS

PDF

93.1 KB Created: 2021-09-11 12:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17150ad7caf3a1eaf42a126fd0b9a651 SHA-1: 8fdbb08e6523379a60bae2a1e1aae5ebb6924306 SHA-256: cb6304e88bca28b4d52e4c31e5083d89c1c85470a190e10dd96d57afc97a1f5e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for SEO poisoning or phishing, aiming to trick users into visiting harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://cructi.ru/uplcv?utm_term=ice+age+3+full+movie+in+english PDF link annotation
    • http://www.fishandcosolicitors.com/uploads/files/piraki.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c462fb5c0e---89477892361.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/pojejefavaxa.pdfIn PDF document text
    • http://caramelitos.sk/files/guzadufugomegosuvu.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/78081529428.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/riwaroroxis.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tuvirijovivije.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/66063967227.pdfIn PDF document text
    • https://seerupit.dk/assens/file/82973284882.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/memuporilirikaseguza.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/99856681798.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/831371007.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613720b142883---wojeses.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/cb9e732398c6ab4b73e796e7ff143167/legesikejizet.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/44115557983.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/pokimumote.pdfIn PDF document text
    • https://kaparatt.com/images/File/daxozonefop.pdfIn PDF document text
    • http://exima.kr/userData/board/file/zudodamurixezed.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/36883648342.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/mirewonixomep.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/44284853227.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/fomirosijulotiguzefa.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/89130409291.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/tesukepubapaduluduj.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/kizexonamatum.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9dbc6f0d---19224281950.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/kefozotixuga.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_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 10876 bytes
SHA-256: 6229b7c8ea361f55b38ac8b590e342fe10359da7cf641d9b788b562ae7568042
font_01_sfnt_off00011d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001352c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352C 18936 bytes
SHA-256: 9c3a3ff9ddd68d5263204eb31535ca2f7e2e5564f8fcdae55ecbe5b5c8bc614c

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