Malicious PDF — malware analysis report

Static analysis result for SHA-256 148853b550b25e2b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 04:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77daa3f4afea4b69d5e9b71047eea320 SHA-1: ed056e65f3998fe4433fcabc0d793579b8464b72 SHA-256: 148853b550b25e2bad2374090dade15e770954c6d76e2c39f6b3b47975e18531
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://latework.cz/soubory/68482494514.pdf In PDF document text
    • http://eunlocker.com/Images/Editor/file/gigekoxunutaxav.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/03c27befb79aef4b0ff5085c0940157e/47342753907.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/kanawow.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/leluzodasotikuji.pdfIn PDF document text
    • https://cargobull.cz/res/file/53211430520.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/55374154821.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/dinusufamufone.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bejinew.pdfIn PDF document text
    • http://adice-area.com/pictures/files/69114107098.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///52159083481.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/72141531816.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/rowogotewalexikugadazub.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/mukidiwugiwubo.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/12408639668.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vlpd1d9fgf9m4mpar94qs1g0tp/34328433691.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/lezovupotox.pdfIn PDF document text
    • http://idcla.net/upload/files/88068153586.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/88407461167.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139861e4f4ba---41941702102.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/53214532190.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/muwebanixamemevisimiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=motorola+droid+ultra+price+in+nigeriaPDF 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_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 17140 bytes
SHA-256: eb9ab266e0180579f06ed95a30b748a146dddabde7ae715fa990927a6109f29b
font_01_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 10616 bytes
SHA-256: cbececeeee31bcf79f9d66f970204456a079bc078707ffa7127e5cb8b886ed98
font_02_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1