Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb927168b18ce34…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 21:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c1e00901872e9535cd7c107f823d36f SHA-1: 33c1ea8b1fd8735a0bf0003779ef3df5a01b083b SHA-256: ebb927168b18ce3457921f332bb727627468d9ce4bd0914925f235518d3e25ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=mi+note+4+android+10 PDF link annotation
    • http://anabakorea.jp/userfiles/file/95591688132.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/zexagozan.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/magosegoz.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/zidozelukevugax.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/favagupumovuroguxonimi.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/96777421941.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/kajarabisubiralusedomin.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091413084973499.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/25917668883.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/xokawetizilukonekupele.pdfIn PDF document text
    • https://basisnomor.com/contents/files/9932544803.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/ruxotawibepeluteloto.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/bijuxivudejalerelode.pdfIn PDF document text
    • http://logicamail.it/draft/media/jimijutux.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/wikufiz.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613381d6d4b5d---43363312513.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/75664809929.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/nimanegepuworuz.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/26887712840.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6fa28cc477db9ec8e5e2a55dfd708623/murusitat.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/xesiwugujijiganum.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b067870310---6320116501.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/95217723186.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/lajotufak.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/69387469223.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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 17400 bytes
SHA-256: 06e81f11c13556ec5349d32c01dd94a8786d428b8a77db74480ea90ce95c5a5f
font_01_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 10272 bytes
SHA-256: 691d4e4550f9ce63001112ca9b58a7170e1be655289fb34b49d9642d5b993dc3

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