Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae10f3ccbe5473c8…

MALICIOUS

PDF

81.0 KB Created: 2021-08-19 06:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3cb97cfae38ad7d3c84cfb9be97d6cc2 SHA-1: 11bd3f873ced3522bb1439356cf84cd167f293f9 SHA-256: ae10f3ccbe5473c8545643f7805393ffb010b7da2462c8dbc1bfe7011d4852a5
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 WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which in turn may serve further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=descargar+biblia+traduccion+lenguaje+actual+pdf+gratis PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160779bab87a41---datidi.pdfIn PDF document text
    • http://mega.kz/media/upload/files/fexakomekibavezifa.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/19648373420.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/kodukeropor.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/foruvozudafonud.pdfIn PDF document text
    • http://isgsrl.it/images/file/nutinimi.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/vubofanofututuxilorep.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/kulenugozowipop.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/rufupubuxidanetosiruruw.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7e0906fc1---57568947273.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/16387050416.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750bf88e14---26455656394.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160738c23f0a96---78614970695.pdfIn PDF document text
    • http://apicn.net/upload/files/36834227535.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/wasutuj.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/49495801930.pdfIn PDF document text
    • http://4bx.pl/public/file/jugebolusixezesil.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf2520f3d---darekebifuw.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/miteveviteribesapafakev.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/lopazesuw.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/manewobaziwumifa.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/manofu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ab21fbc0560b5bcc78c90c284234aeb4/giravoguwuz.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eca6kdhvvgf0r6bpj1680f6i84/62283979946.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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 17780 bytes
SHA-256: 8cba68fc9bf5003b04cd39457e5579f48c89c8703956b38c1c526f6a5687eb78
font_01_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 11168 bytes
SHA-256: 3240a347004e5d533d8d3e0432ae646531e68046368b562d0544a32746853e07
font_02_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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