Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c8db9c24791a9e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-26 17:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 697475b0ae787d6072995ca2a510b97b SHA-1: 7509f513eaa8d3582f5ca7b522d536003e994f24 SHA-256: e9c8db9c24791a9eb1dccd27c8af8a7f7b6ba072d64e9aca62624d336a5d07b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://shiinamotors.com/js/upload/files/zorexagajuwusupu.pdf In PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161319ea85a56f---38121557163.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/xifedozatitituvuluxe.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/xijijaronefizawizobafudok.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/tefelopulifewewobob.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vd9j10h2qfgbdvl4fjdle66kc0/15753428641.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210916020612_343740.pdfIn PDF document text
    • http://maihome.hu/admin1/file/84139998693.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/98133611090.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/55567648509.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/05195316337.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/sijuxuzuz.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/29041746172.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/retuzetudidavawewewe.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/47934377257.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/5561769265.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad57d7a651---24246769658.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/29268868216.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/wanofenakigizezer.pdfIn PDF document text
    • http://tulga.ru/editor/files/78873111296.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/78538784407.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161437c1d3804b---72684851728.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/75978076820.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/11340404311.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/18374481660.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/69388350483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gta+gba+rom+downloadPDF 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_off0000c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC245 10464 bytes
SHA-256: 0adc685574fa70b99a4fe5dbe2c4d034209fdf188eb7a42be3cc03b7ef743381
font_01_sfnt_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 19816 bytes
SHA-256: bae6f166640c164e27a9c9979e7323e80bfdd6ee7f5bc636fd1135b62bfcf114
font_02_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1