Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe520d0f61921c9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 14:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba7dd3c85f9e33434192dc89340c1f8a SHA-1: 757cd9ca739ce3758737c7b8ad3ef5e0f5e211f3 SHA-256: ebe520d0f61921c9c2899a81d1b0b7e1dcd64bb25c976cc930887b91a5144340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, which in turn host other PDF files. The presence of multiple links on disposable hosting and the use of compromised CMS upload directories suggest an attempt to obscure the true destination and evade detection. No scripts were extracted from this sample.

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 http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba94d5656---zedubuzodozeregoneter.pdf In PDF document text
    • http://ijdssymposium.eu/upload/93223658485.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2f03120a6361af630ac183d836e8b7e4/fetesiganunadanejapuwumav.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/tedamazagoranefuk.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/448tc4qukhm6h2mbd0mughl0o1/tuwobanojebur.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/52545289720.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/xokowufodek.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc1f7bda5---97412459026.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/kebulizana.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5403485a20---jazokadupujezinenupigak.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/3dm7k3irjn2mtum7bm87pm7en3/wutiwodepi.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/lifejatifinerijupasok.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/duxijo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/zubuzukefalise.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ra5084v74hokufgap3hhg3ocjq/velusalifepawaxixagijexu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0e829e88e4421b6106c736786b38596f/wewupafidake.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1db545cf0---zaxolugoli.pdfIn PDF document text
    • https://shibbirs.com/media/files/83631629965.pdfIn PDF document text
    • http://schubert-hh.de/image/file/fotidado.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d0af1c14---42649928981.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/lejatekeze.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd11ce687---wunegaxarutin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ejercicios+para+nervio+ciatico+pdfPDF 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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 18848 bytes
SHA-256: 5f992173224b344e9866e0e941f41def3fbd58fc216f4d8e6b0a9a59823ab48b
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 10744 bytes
SHA-256: efd1eb289049fcc5778078b393fd975abf071242093dd193d38aadc4c4a75684

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