Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee8de3041059d42…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 14:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e659ff1f8db4d15032af06320954500 SHA-1: 8f85c108fc023571d01bca7b4a469de0e41c0052 SHA-256: 6ee8de3041059d42fa5fc12b3d71e34a413f6075bb0c6a61a17e2b5749447f56
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is identified as a link farm pointing to numerous potentially compromised or disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for distribution. The embedded JavaScript likely facilitates the redirection or further payload delivery to the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://daieimotors.com/js/upload/files/fegina.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/wukixibo.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/pudoroxevupurojutur.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/rifas.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/45119690744.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/87154674298.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/1715688420.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/sedotor.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/5772099832.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/68029149801.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d7a52910c---64014452754.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecef3b03df---50305905380.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/68925107149.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/26803801226.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/zotasimitalujowiloxiz.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc4d37c56---77000864810.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/84539204868.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090303550073499.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3dbf6e83c1557624c2fe1a45fb1beba1/68051173995.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xodelidavorimanox.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6554b5b14ccbb8fd0e86480498276d1d/48458396933.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/pabusikamaragezogox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lumber+tycoon+2+cheatsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4c0b8f8a7c53b4868c8f6e89faa9522f/zorubugigif.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_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 10788 bytes
SHA-256: 3956f89c7712de842ce5a1f2e15db71d571945e96ec880887e42ef3e7745892c
font_01_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 18108 bytes
SHA-256: 340790b806e963be7615d7ce9e3375874dee4d9fc8e3a38368d55897f540f018
font_02_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1