Malicious PDF — malware analysis report

Static analysis result for SHA-256 10908ca379c6d28e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 03:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae9a0871b918f6467bbb1faeb8dc1916 SHA-1: 397386fa2ca71c06c6da3f2f429478bf2aba5f8a SHA-256: 10908ca379c6d28eceec47062fb832e0f26d19faf5ab8bf086249dd67666b602
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely facilitates the redirection or download of further malicious content, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b425ab0a6a952fec4e2436a514bb5b9a/tobopepusopedetesoxise.pdf In PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/dabusupiwodiwerivoxopado.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/kesoxojobotutukulage.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/52611669196.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/dakokerivizudojuzon.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160846973be9db---wakozibimigovubamuzos.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/valelulup.pdfIn PDF document text
    • http://houselandia.ru/files/46865649899.pdfIn PDF document text
    • http://linker.tw/files/96265763130.pdfIn PDF document text
    • http://kaies.net/upfiles/210706105758353952fzmlwg.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/71284238154.pdfIn PDF document text
    • http://land89.com/ckupload/files/bitejurabulameripodadoza.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/14662800448.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/80638184217.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b125691d62ded7e21716acc9729c7065/bepudatazarewib.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/35637593227.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/425253f13ddd7d0d7c47e610006d2714.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/61238518180.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/9755705679.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/73266486191.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/tekebedabofozumim.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/85104202509.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/59285545708.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/pewodetadun.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zomanurepafunutubota.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dd9ee73e---pugopasul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tribes+of+the+worldPDF 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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 17608 bytes
SHA-256: f5a15bac4f936e7643492e6851551788a7d4a644791a001cc50868b50dee2339
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 10372 bytes
SHA-256: 88d6a8ac2c81b80b297cbd3bcc42b9aef467dddb49ee45b638b46d7cf0fc66e5

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