Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0886e270cfa859…

MALICIOUS

PDF

70.1 KB Created: 2021-09-11 02:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ae40ab1c9d9d06bffc01a455dc07ce2 SHA-1: 89e1c9f0ce9e24de9fe6fcb5794841651f8e1acb SHA-256: 2e0886e270cfa8597551b5619e3b992bf35980d7f8803c2cfef95ba6e3a75f25
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of external URIs and compromised CMS upload links suggests an attempt to leverage these for hosting or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://objets.immoweiss.lu/userfiles/files/fonibulonojexunurofiloref.pdf In PDF document text
    • https://hotelangela.hu/userfiles/file/55307237281.pdfIn PDF document text
    • https://ienter.bg/files/18041832988.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f529d8c440---zareta.pdfIn PDF document text
    • https://granitnet.hu/editor_up/26650633407.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/powujosuxuni.pdfIn PDF document text
    • http://apex-architect.ru/images/file/vowewatowojomufi.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/90698758913.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/dewabatiginiwidorabudajib.pdfIn PDF document text
    • http://tcihk.com/userfiles/76021048430.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/vajubumukon.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/47543134505.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6a84ba3e---14042452939.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/vibumagitowal.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399b98cbb16---80993714873.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/najaxubuvivepix.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/39787742088.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/52306140855.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210901102242_OTMzNzgxNDQzMzY=.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/87727887765.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315dba8d200---89110727148.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/esjhup8mhdua81adnneqf8ocok/5208403573.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/topokaxuwizusok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=watch+live+cricket+on+ipadPDF 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_off0000b361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB361 10592 bytes
SHA-256: 6168af912ff9c67846e25955f83fabd7c3bfc8c369d3e6d10373c7cfd74903d0
font_01_sfnt_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 15424 bytes
SHA-256: 8b4428529e97bfc072600099b9f1bb21b830d3329119b5964a6a616d41ef023b

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