Malicious PDF — malware analysis report

Static analysis result for SHA-256 b721393665fc7964…

MALICIOUS

PDF

86.4 KB Created: 2021-09-14 22:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f94d51b65a1d557ef372444ebec9f3ee SHA-1: 8fc98e06224c0f7f5b0f95152fafcd0ebeb431d3 SHA-256: b721393665fc79644b33dce94f7c7416b1866c4ba2162792d02f3f3d9d1cf6f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=to+kill+a+mockingbird+pdf+chapter+9 PDF link annotation
    • http://chalappuram.com/userfiles/file/kizalupowaxasisuxiba.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/70278444700.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134de093d84a---noloxekibegosiziki.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/97462702622.pdfIn PDF document text
    • http://electric-kernbichler.at/91771396579.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/7266018846.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/86445821137.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/relobegakifimipexi.pdfIn PDF document text
    • http://email-database.info/userfiles/file/selimimakonoxiv.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/598262501.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-2/20210902103434282618.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/52b3542782ea3272a88ae872763add6c/gopifulubajibetuxuzut.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/gedajisoxitebimavusixedeg.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/nasov.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914113438854475.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nawenivoxagoredevu.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/34100328537.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091207043270554.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/90341814419.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/mosaxifakaboluvoverim.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/83000373049.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/13104270332.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/nixujo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5393eaa8---99829551818.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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 11260 bytes
SHA-256: bcf49a974ae7a3eca1c2aa9bcfc51115a3dd906a95c4d73eccc33bf8666bf625
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 17808 bytes
SHA-256: fe72c238f8feebdda39ab614d7d2e47a3413489a274985aefb6a8b320d449c95
font_02_sfnt_off0001341d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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