Malicious PDF — malware analysis report

Static analysis result for SHA-256 0621b4b5ff6d423f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 02:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 79541be695bac2a770c3204e9370f011 SHA-1: fb8ba80cc3531994b04e75268d284c72d741af2b SHA-256: 0621b4b5ff6d423f456eb3e8625c276b596ecf55e950196c4ba99e8b690cbc36
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely to redirect the user or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://legyenegyjonapod.hu/userfiles/files/3483541673.pdf In PDF document text
    • http://www.blueoak.fr/image/file/49398170033.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/bamanugakuluzerapapumod.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/1680912155.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/7250020987.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/piparinamolifiwem.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/rodakob.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/rolasenegakijeporiwak.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/raginevirawapanatupojona.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/58198809513.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c4c4d038c---32798542125.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1213558f8---88754898586.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/36222362000.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b793d0253---65310389034.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a79bf7c3---fonifopox.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/demipidaxuzasupofeniw.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2cinnog9a2j7u7t7dbldoroqbm/biruxuziwol.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/torokute.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/givagorurimototikagij.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/pesenuruseratifoziki.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/9307606174.pdfIn PDF document text
    • http://midospa.com/upload/files/20383800016.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce2061e63b---61784939435.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/13815667995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=moto+g5+update+android+9PDF 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_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 10748 bytes
SHA-256: f9055ccc093319be22b4ac4840ae6f81f7c072082289a79ae53485d88cfa807b
font_01_sfnt_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 17692 bytes
SHA-256: d5df30147f339e65ed93de1553b7466d1417aef390840d7f1556cd5013116346
font_02_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1