Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebef91c5a461e10…

MALICIOUS

PDF

74.2 KB Created: 2021-09-22 23:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1e78fdaee1283b232e595ac9dea5341 SHA-1: 230f5ff022921ff8d9d9594bd1a47a490a5d00f8 SHA-256: 9ebef91c5a461e1016b3eeb82642070b47612ce50c965997fa35ae133d34929b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=big+chest+workout PDF link annotation
    • https://akvaguru.hu/user/file/60275122705.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/43441295959.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/60039757093.pdfIn PDF document text
    • http://quetthe.com/upload/files/waroxobabitopegagapixodum.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0bf94584e770c77f2523f17bfff0b96d/bumawujiranobagelisegem.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/kiworomuzifit.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/63139115792.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/54061206182.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/lukise.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/19119853241.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614827e0b1b4b---nazowokoxilopoxop.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/zaxeguzufa.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/4279346343.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6da8ccdb---60352962211.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/68552913634.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/63499564439.pdfIn PDF document text
    • http://rem-proekt.com/f/file/foveworin.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/36368763178.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/84403156314.pdfIn PDF document text
    • http://airmon.hu/images/files/56654046285.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/46a2370118c9de5db89f0882590fb667/68308014948.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/nivoxuzuzemo.pdfIn PDF document text
    • http://ceroki.com/image/files/5102095841.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_off0000c0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AA 10528 bytes
SHA-256: ad6301c4cfdf2f8b38b6cdc5499ec40234b93e0b26bc9dc861138010fc4220ac
font_01_sfnt_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 16588 bytes
SHA-256: c96c974c0c1e86bc6ac779e430adbb5e249fb58c7d9f1dc00586d4f8015d0b75

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