Malicious PDF — malware analysis report

Static analysis result for SHA-256 9adbbddfce6c4a70…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 15:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7d02ddc78991809731740d524316b45 SHA-1: a3f11ed063e31d82b311c8eb082a894c52f44d54 SHA-256: 9adbbddfce6c4a7001e91fce10987cb72ef157812c4c1dacd775693264fb1fb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a critical heuristic firing from ML_NYX_PDF_MALICIOUS, and ClamAV detection as Pdf.Phishing.Trojan. The sample also includes numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/00pqsg80veo1q69t84trji2git/xukux.pdf In PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/pokagemo.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/fomiwituvufadutijokema.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/xikopivotapewuzitimozeza.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qkh5nv6oukfga4ni519olmi8so/guzajakevomenarabanuwa.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/9755175940.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/boditezuf.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/13502673546.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/36016337958.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/baretekimadinizazutaxowit.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/wadopigikozitajusumatoput.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xipisumovedepodudojox.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/96852640165.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/kolelikup.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/wesigoribijoxuvilenotuxel.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/12416918089.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/totamevaz.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210911052040.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109120631142983.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/45005333773.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/49907272636.pdfIn PDF document text
    • http://handgun.ee/media/file/rowoxi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161314068a7c38---nojejasuxononekegoxul.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/kogomanim.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/12040723078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=install+android+on+kindle+fire+hd+7PDF 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_off0000c644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 10544 bytes
SHA-256: 99a42140afb2f624370439daf7e55d4213a48cebeac403ca475301b00bf0add7
font_01_sfnt_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 17048 bytes
SHA-256: b0b8ae96bbaa792971c48271dda6c9fa1e4b73d57fa87f6e6d116191403af5f6

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