Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf0effb99fd0504…

MALICIOUS

PDF

95.9 KB Created: 2021-10-12 18:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 708ec2fc9b56e757105662dbaddf243e SHA-1: 3ac199e897c6c78b00945da362a99ea2c04c496a SHA-256: eaf0effb99fd0504ad55b2472dc7ad9a79a950972b03da2d2b827ed48db584fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://ketchas.ru/uplcv?utm_term=sony+nsz+gs8+root PDF link annotation
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1639a9a3e50c0020b50f72fbf9bd6bf4/jigoziwiwa.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/64106415720.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/pirovidoputak.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0a27e9f1e---rilutefusukiwopeja.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/jojimixiwelepipegexeb.pdfIn PDF document text
    • https://scalper.ir/data/files/file/87293387380.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nd6t3g6o9239cu3s3qiliqs7v2/kufazemupubufomoro.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ee1f6a408f---betumekezib.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/54563966915.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/98645610989.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/99893957907.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/9rskl1g8q6h1iql4dd8cecol72/fowejisexesolixijuvuf.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/sulil.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/gomurudisirepivovevep.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/64601782740.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/butajerebutukulane.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/dirafivudasuzev.pdfIn PDF document text
    • http://chongros.com/userData/board/file/60790612733.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/60197790707.pdfIn PDF document text
    • https://norservis.com/files/files/jewitiva.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/zerinivulobo.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/xadajid.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/84486970083.pdfIn PDF document text
    • https://geniodelweb.com/file/jejigosofinusekuxugokar.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161613297b36c5---12980564916.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/vokisizofajifigefunin.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_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 19864 bytes
SHA-256: 9f03255b02c957c3661c450e04134ebf70a3f05a606ce863db39472684db56c1
font_01_sfnt_off00014230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14230 10308 bytes
SHA-256: 96134e91997d90f98ac70102fb63fc2b32d1c43fe1562663f7b3853e878a16df
font_02_sfnt_off00015995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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