Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83899ea5cb230be…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 10:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8bc2930ffb8a71f2dbcadf78723a3490 SHA-1: b7a3482bb9ed11c8ad90b0600f229bd0e04c2f8b SHA-256: f83899ea5cb230bec172efea38d651b06a522316791f790a1eafbb83c9f8d239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=what+is+the+best+university+for+acting PDF link annotation
    • https://pet-fashion.ro/mm/file/foraloj.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/bepezopinewuzudaliwubo.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/gugavitepexemupafege.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63701a46c---40056445801.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/wopitizewilosexidewevef.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/desenikarivebazavarej.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098617e9da21---93554102744.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zogona.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/82ef94b7caaf698c3b6adbe7a9c131d3/21653308234.pdfIn PDF document text
    • http://fittbike.hu/files/file/95806502566.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/foraza.pdfIn PDF document text
    • https://activepymes.com/pub/file/21040224308.pdfIn PDF document text
    • http://uci.ir/userfiles/file/95705301589.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/kdcp5e8io3gs6a79c8r9tjuao4/85263466384.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608529fa906d4---90742029053.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2f4ca304dbefcd7516f57c8117feb5a1/26682128835.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/minasokexuxomasixe.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096044de3fee---71043719752.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd702e419---xozaviwe.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ae2ac089---gefupidumizigegasad.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/noromosixajelevuzojakiso.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a20bb88bf0---342473251.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_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 10980 bytes
SHA-256: 2dedb1b5be5a12d1470492053f69a45b511bf72a03c9777ebbd6ef2ee9f85e17
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 17596 bytes
SHA-256: 8933007d85240cf5d6fe83ec4cd1abc5f532f4afbc8bd4736146f2a8100a170c
font_02_sfnt_off0001450d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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