Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fffc221bc3ae61…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 11:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf23f49956021a412e6bf9513d11faa7 SHA-1: d989872e05504adb541e5ca60f38a33dff6db875 SHA-256: 90fffc221bc3ae61c7c956f15ad06a0feb2a65df300a9cc508b9fbff2ef6586a
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 disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://jorkurojus.com/userfiles/file/vewewixova.pdf In PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091c3c464382---15993089807.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/30732983063.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/palekuwukazatitovezisetek.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/didolo.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/64354437462.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/87377842811.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/pugapigilabopinajup.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/lunur.pdfIn PDF document text
    • http://slsnn.ru/content/file/gokozulizenobarig.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/rerero.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/otj0bel0bss5trbakkd9lngn5i/zodob.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/39442333422.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/tawubujeniwotavidanokog.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/63973501888.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/687e2fbc8dd7c2f7e9be9ce8868fed1b/42416110202.pdfIn PDF document text
    • https://harom.ro/files/file/5327915413.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210615164940.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/97448188372.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740aab92426---luferadudivazobojitaboda.pdfIn PDF document text
    • http://www.polni.si/Images/files/32154949987.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/97801551583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=soursop+and+cancer+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8fea60cc0b13b4d576a331ccc1532cb2/bipogebona.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_off0000b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 10552 bytes
SHA-256: 785f280b70c2d32856e1e96ce06c00b03192bc1f6f1b824425ebb583ad7a80a3
font_02_sfnt_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 16008 bytes
SHA-256: 288d60cf727f2cf37ad7074a30d48644d31444a87ce47e38acba6c0a154bf994

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