Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bab297b7a60ef13…

MALICIOUS

PDF

121.8 KB Created: 2021-06-28 10:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e28284a667678347b584e82e74b2059 SHA-1: e7a126fc0dfdcbb4c8e45c4ff6d26f6cd6a7f22a SHA-256: 4bab297b7a60ef13a20f5b32bd8acd01f4e7ccaa58b9bc0b965e1319eec9cc1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used to distribute further malicious content or conduct phishing. The PDF structure and embedded URLs are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=answers+to+go+math+grade+6 PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d537eca6f---sodoj.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948b58e5fa0---wulobikogol.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vjmrplvphngklhfbud4irrdcjd/fiketum.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c62ad61c---14098219927.pdfIn PDF document text
    • http://veribase.com/E/file/7620349211.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/jonezorosakelex.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/geneginugi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2bdd406fc648a08c0846fb6bb3138dc5/jipak.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c733d71852b---meviroxawejegiwexajikew.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3325be99f15161f6400b97c42d0ef37e/94583423939.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/93470949866.pdfIn PDF document text
    • http://schokozentrale.de/idata/komamixufujaweza.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ckmpkq46h45ok34q1mq3pubm98/deliromojudexebibevivi.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2hhmnabllgkbn9c2c79ovpmf7a/50177239228.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/69277205876.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/39387637732.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6a40edb6efe03342d4056be5ab085c61/60464906586.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb0f57603---37457668706.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c15e56889cd4086fd4818bd6ca3d4c54/45302218118.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/82251027615.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160811e96511e0---67078285615.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_off00017955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001916c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1916C 10792 bytes
SHA-256: b224e535ef2eadc210d4bf153f585ef7d231378937ad03e5857db56190ed2271
font_02_sfnt_off0001aa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA0C 18012 bytes
SHA-256: a746b27e9bc5ebb9707852d8a51ba7b500397d265e52182a62b73c7daadcd183

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