Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3f8930bbe7a3fc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 03:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f0ed747db3575e0c555feb6714d9098 SHA-1: eeda858c2c4ca9ea236005b467b70be92e995fd1 SHA-256: ab3f8930bbe7a3fce2a621887210df8847ead29d05829afa478374023e61a9b5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and other disposable hosting. These links likely serve as a lure to download further malicious content, such as additional PDFs or executables. The ML classifier strongly indicated maliciousness, supporting the interpretation of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://kunmobile.vn/files/uploaded/20210915/file/soxaxe.pdf In PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/mokijugolewulugub.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/76141057772.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/54437752324.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/bemozo.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zuketaxaguvo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613187923c282---64809221988.pdfIn PDF document text
    • http://it-hair.com/userfiles/zuwanugurekifux.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138f90592686---89054150451.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/76416239963.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/63620026352.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/50460791622.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/56245899702.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/xisekoxupupofodiwewuruj.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/49066573756.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/28230810214.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/meganolexoki.pdfIn PDF document text
    • http://www.moyekolodin.com/files/mapusu.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/62051134390.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f11702256---xovono.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/sefekunidaje.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faafc0a107---figuxibotufedi.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/78152631842.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/motunufoxumoredufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=word+that+starts+with+r+and+ends+with+rPDF link annotation
    • 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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 10380 bytes
SHA-256: ad04b5d56f1a156ded6974c7982c757d4d2cddfc0df12529574dbac98756ddeb
font_01_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 17268 bytes
SHA-256: 6c3fa27e9f1bdb19c1a368ed37887b27119c5dd71f9954765dda01a7c29b0bec
font_02_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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