Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b436c790cbef6e0…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 15:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eaed988a5421c65439d7e6ec75b4caa6 SHA-1: de77ab9806e2164a3c43fcc343699bbf4cde7933 SHA-256: 8b436c790cbef6e00ecb34b529e9dc0d9e04aa493ec19fecdb08476b2d1f474a
164 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 and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=neutralization+reaction+worksheet+doc PDF link annotation
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607473b6afa04---39757461197.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/2215023156.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f4603aea7df963220ad11690885998ed/19685097595.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0cc43e2c5c35376502474ef0f5e36db7/wobajurup.pdfIn PDF document text
    • http://rubensova16.cz/files/file/gemozojosi.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/50348133947.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e707616f0f2---lukupaworivonepewufepom.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/japopujefive.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ed464a7b---buvutijewofezusegu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ff170e2521e35511869f5ab3f26f48da/49620918835.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/6334036738.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/guxelogoxozituradeseni.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089c73402038---sibope.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/xizagaraxu.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vejitabuditikofe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gelutazu.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/34969277840.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6e4d3ae1d7b740042edb9cc56ab91019/93635153231.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/680585d880f6f71c9017e443b6a2628a/patizawavujuminoza.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/sosixiganefale.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/62339124700.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/saks1gbilta23afh3hmmek6fvd/xefuwanafonagitijuwaf.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/23738110471.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/2b1352e07c97b919882250c95146d7a4/94216290023.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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 10780 bytes
SHA-256: 04d889fa26b8a7a087eb95d386b856c6de358b9bd8aa4c0b59f62f1a944dfaf2
font_01_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 18148 bytes
SHA-256: 8a2546777a00c9b7af404929ad662cadb98a70fb62b3a9810299f76cad4a3857
font_02_sfnt_off00013c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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