Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ae62f27a731026…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 17:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc68f0f44a541b8093ddc91bb33e78ae SHA-1: 0467b48cd48c4e8102d51319b73f155acd3f0ad7 SHA-256: 18ae62f27a73102684c9c3015055c73c6dafb05b5709431043192f4dd6801982
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef82d5bbd---ganatejesawa.pdf In PDF document text
    • http://tnshoppingbag.com/upfiles/file/dizirifevesosezutasoxo.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/31736185108.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109090824116759.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/falebepevosavefek.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/fabitotamufenewasofevafu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161393428e8785---lumevetuketokufezu.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/22360238398.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/17895460833.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/reserajixebovopem.pdfIn PDF document text
    • https://camelcarpet.org/d/files/94400694626.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/16283099130.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/df63d7e501c4ecc2fff2f90963ca3516/26507546132.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/tutetuzog.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/26877891307.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f6a9a5d2---femugakamofufibab.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///86919490079.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/kukemufezutokog.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/93120482647.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/10453429422.pdfIn PDF document text
    • http://oris-am.com/editor_up/92074211710.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/21964872807.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/sudibawovikexezas.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/34180643745.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090410051428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+close+my+browser+on+my+phonePDF 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_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 10852 bytes
SHA-256: a7c77f40653bf9bf86ef04ce963729bf0fe96c1aa78c63be3e2da15661d88ba1
font_01_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 17304 bytes
SHA-256: e18fc348c864ae4e7c2439273613576d698a2f2e84334796789a7121d2a00917
font_02_sfnt_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1