Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6733b375658078…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 22:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b292c1fac18a5a01acd9392f09bb07a SHA-1: 278d7dff09deef743faf60ccbe7d71bf37685221 SHA-256: 5f6733b37565807864b68c40dfedee5e411e1f64394dbaa4380542d2fb2ad5c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or direct them to malicious content through these links. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cn-junsheng.com/upload/file///20219342064550.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39b899850---xawidoburujogej.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/gitegizokubodosezotegapo.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/pibisutodaxakozolulanuz.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/29117594469.pdfIn PDF document text
    • http://rapet.hu/files/63603203422.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/jurirosojodorojokawobum.pdfIn PDF document text
    • http://stisk.com/file/60012395882.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/74404677739.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/jitovidupofo.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/tefuxivesimagiza.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/muvosokopagamomezug.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5360d99c052e06ada7b038614c8e68a6/36596447946.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/75472057027.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/738ju5a8q400in36sc9s8r87ov/23828668924.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/pawixijozipovasasotafu.pdfIn PDF document text
    • http://analhospital.net/file/files/3253361818.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/32807118359.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/934e6e26eda7448535444fab6c88de23/mejajiluzupubu.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/2085380326613f3a5614ba5.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/gemunipezinefed.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/80935714342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=add+chrome+bookmark+to+home+screenPDF 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_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 19796 bytes
SHA-256: 92f5bfc00bf171c04a2c7283bcd5095483ba60c20b9bf5c175c748da02399497
font_01_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 10712 bytes
SHA-256: 8a70c7cab75b8f99e51936d0cfed8bf8e13ac5cc2fd1d5b6e280e0e19aaaac1e