Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb48930d95f325e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-24 20:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8effa9c1636da4c1c77bd8e05503b9aa SHA-1: 36096f8cd9dcd80377462185a45520b541152b8e SHA-256: 4eb48930d95f325e4ebe2ad8c5f6d25732134ac4ca3a8471627fbbf290ec0ede
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggest a deliberate effort to create a link farm for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://smidgel.ru/uplcv?utm_term=dragon+ball+1080p PDF link annotation
    • http://bienchidan.org/uploads/files/zovomifafurerizup.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/aaeb42026e8fe71699cb4331bf6b1373/60849194370.pdfIn PDF document text
    • http://thevale.us/userimages/zodujuri.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/kujaxesuxupuxapolap.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614a41e200872---wopofim.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/43117371268.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/75730462739.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/25821376914.pdfIn PDF document text
    • https://servicio-mexico.com/images/file/gobejiwekalajenopugizudu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pubawomedare.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/50921471120.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/1600505655.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/69862185208.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161487c6085c58---7816635498.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/pugarevopakibu.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/52038114468.pdfIn PDF document text
    • http://coachhouse.info/assets/file/jixafunejurevefefufip.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/84554277762.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba37bbaca3e4ce4d9be9806db01dec83/joxolebirabafopujisafo.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/73699580295.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/gatomojilederomokugo.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wogipofudadixo.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///feteburutelalez.pdfIn PDF document text
    • https://davaocarrental.com/images/file/sojazawalog.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/sabujaruri.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8c8900e47fe310d59639c2e208f2be92/xukudisozowanakivifawatix.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/15225335192.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_off0000c261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC261 21264 bytes
SHA-256: d5f8eaaf1c794f59069b1fa16368bb612050a073e5ab7e9c8fa01be59c3dea31
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 10460 bytes
SHA-256: 188e6eb4699febfcfe66dd4932918ff183a059f549c6a356c6a72722cca2331d

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