Malicious PDF — malware analysis report

Static analysis result for SHA-256 9349de265662d421…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 01:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a46d4546b4181063398d83927f4cb47 SHA-1: de68906801094acc3e4a3ea46d1c6c10a719a728 SHA-256: 9349de265662d42137771ae4ade324ea5d38ac051cfbe0521c9a4d2ac377b0e3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, directing users to multiple domains, many of which are hosted on compromised WordPress sites. The presence of numerous links and the use of disposable hosting suggest an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the structure and heuristics indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/471a5f6b941489509179e6834b216c2e/pajoj.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a676f8a41c6---mumaxixawixapibore.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kd6ku111rq6l04uiv0onuu27o/busipudufu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610644c520c7d---tugofefuvudof.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/18189524028.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba608a51e8---penek.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jedazitakodanowowozufuv.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074827a7b200---29562701258.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108031547161406.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5nd2ib1noh472m81odavs3fqrg/zumilazeses.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/k045aofosqif7bv729r6r095e4/kubevomibapixotimixu.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/zepubowofub.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad50b42df18---84454824924.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/95856129562.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3adc15c0e5---75582539685.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a447d63bb60---16940532334.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/jiwewixubuno.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/muvvo6ijenmjfrpqcsjl1k4te5/67998971153.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/24611315797.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/fed22a24fc9cc5d9e67809506ea0d641/5853428906.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/gaxofavasakalevaru.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/valapomexakekekedojirijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=converting+between+units+worksheet+tesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 16140 bytes
SHA-256: f9111895c0ffcc8bdbfb60831c6751eab2cba55143c524497615139d1439967f
font_01_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 10692 bytes
SHA-256: 8973525b400759b46086c06ccc3e989ee7d7075c60988a93426efa3ed26e1772
font_02_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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