Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc299a8d8d647d7…

MALICIOUS

PDF

99.8 KB Created: 2021-08-07 22:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29d92441bc6a213248b7db1ca82a0778 SHA-1: 5017cab7405cf9f45eff20241735a315d52bbe87 SHA-256: 4dc299a8d8d647d7503e80a917390defb1faa13274399646d69f1474462fc195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://minhvuongthuphap.com/upload/ck/files/fafapetosimos.pdf In PDF document text
    • https://cpsguffanti.it/uploads/file/guwobawewikixe.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610eacf0abe30---dafasanuwulegopux.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/35640211013.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/bezod.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/h9dl1ldfvjj2nlt8fjoh4l31vo/94903128378.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ra0onsjdi9aihhconps1i2juhi/6800531029.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1cfc8631---muriwexefadikupideda.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/79038797356.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/4agl7vomel795694c3dcapvl8t/zogogoxirufubatagazukul.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/feribunaxow.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/bbfb008b1f684c282a51b2931cec2f94/79138257342.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/97606701850.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/vofowe.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ed036fdb---wegevamigidarerebumugi.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/nolabaxipaj.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986643b8841---roposanomotixur.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c7906180---rivatu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9f7c1e58---23239843019.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee502af83---numetuzogifuparefewa.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/62349150849.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607de34b5f5c5---34253057022.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/nevekosixex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=manrose+quiet+extractor+fan+instructionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 18472 bytes
SHA-256: bd8060b4d8b59b8470e4efd263e6f85c74046ed5c54f781d4d4f1e09e8dd08e2
font_01_sfnt_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001530d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530D 16120 bytes
SHA-256: 19fb3e0837d6f9ee728c5331d7bb33e1bff3d595bd4ca4a0aae7833d7d421d60
font_03_sfnt_off00016868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16868 10624 bytes
SHA-256: f62a3069921a1dca22a3edfd31c06fde3f3dd57fee084a4057a42624124fcff3

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