Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e5025a8ca80a03…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 15:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99ebb4eeb5923de3e686c2a54fbdfedf SHA-1: 0ca53f916de136024b3e3b7ecd3a00f942796192 SHA-256: e4e5025a8ca80a038b99a51a9f54a115fd5ac2216ef149f14552c1b10a7e4a3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=play+sims+4+on+android PDF link annotation
    • http://tidomusica.com/uploads/files/202109200356317106.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/45706930455.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/pepenepigumuvowinasitivud.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfabbf11e---55024181080.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcdb799600---vugetizuvonow.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/tuberagado.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/cn8mtgreis48ldep6qnknv0i4i/31728491655.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367e5f26aa7---26251936893.pdfIn PDF document text
    • http://asfalon.com/__files/file/40816053550.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2d0obb8m4rhmsu77d0lr5nbb94/20112654745.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/durikomivifewelag.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/tifalosezuwuruw.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/67580484535.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/36506252263.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///borate.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/rujitu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e713561cb---69951987322.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/tesobi.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/98818834921.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/944397020.pdfIn PDF document text
    • https://la-klamm.org/Files/files/disomuvubiba.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/kogeju.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/gotokelinizeraketejivabu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/zijevirodoxapixamuked.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_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 16316 bytes
SHA-256: 94881bfc2cb2b1cac2d80a6cd11b8bb4c0eff20caf45f33db198b7e88d04e412
font_02_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 10372 bytes
SHA-256: 0eaf8e330d4bde401aa72c108174230614fb82eab3e820b1bcb7642a4f80cdeb

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