Malicious PDF — malware analysis report

Static analysis result for SHA-256 4729ead4fd0c030f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 14:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 783182d35e5608ba961ec78f68929443 SHA-1: 511955919ef4083fa772bb6f72807b72bd891a10 SHA-256: 4729ead4fd0c030fdb71296d198550f6d6256a515bde489d2fceffad512a3260
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://corianderedmonton.com/ckfinder/userfiles/files/22497749739.pdf In PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/81946953443.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/42bc13f641dc45570dcd12f8588b175a/57408210144.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/pagusemobuzemosazabumu.pdfIn PDF document text
    • http://flomojapan.com/upload/files/67998103284.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/77826469794.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1747417456613fa3230dfe2.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/6838794982.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/60202583242.pdfIn PDF document text
    • http://juncheng.tw/upload/files/bezuvowabugolijuxoni.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd74be23d---81573810141.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8f7ec0f6c---mivunusegiburene.pdfIn PDF document text
    • https://koratspring.com/upload/file/vokafekas.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9cc7441b---busogikafofevoda.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/66298111402.pdfIn PDF document text
    • http://ktcz.eu/files/files/rovosowofojadojizokukesiz.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/46768044223.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/40465909416.pdfIn PDF document text
    • https://go2germany.ru/files/file/16564403217.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe83cc4a1f---latomijajobifasuguxodun.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/6893255098.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/95199868096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rpg+open+world+offline+androidPDF 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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 10536 bytes
SHA-256: 8dea01880e7e96eec30e7db69257a4bfe7cedbeb021407a040e91c825a888ed1
font_01_sfnt_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 18016 bytes
SHA-256: c75bc5c60264d0e0c67d7f491b6d1136de6e9f6a42a8dad70f91af7417daf607
font_02_sfnt_off000129a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1