Malicious PDF — malware analysis report

Static analysis result for SHA-256 58072d86c523eec2…

MALICIOUS

PDF

85.2 KB Created: 2021-08-04 16:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8ef6a78a8ec1fa1cc6ef6c5d9530dc0 SHA-1: c894538a20050ab7ac8de5b554a907c1c3385543 SHA-256: 58072d86c523eec2e7f504137102613b6e697caeea2e7bedc30fe1a8148e6ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.alcera.ca/userfiles/file/sibevogobuwefogubotig.pdf
    • http://1-sanya.com/blog_images/blog_/file/rediwemobogitukekivofe.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6aesbdvm6po5vdal0icbhl5uc1/56964411957.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a53ba54a7---88089504138.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/jebodemu.pdf
    • http://astro2sphere.com/admin/images/file/nevad.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e52733b4---mutajepasaba.pdf
    • http://aitrans.org/UploadFile/file/F1202106270503548200.pdf
    • https://comillaspostgrado.es/userfiles/file/nawilikunisaked.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8882fcdd19cecea17dba58d4edb363f/26601800717.pdf
    • http://hzzxtl.com/UploadFile/file/20210625135137614.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e4c890b7511---batomikinurowe.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/8rgh4u94o3dfbrqpf8k6rtj7q6/64913825992.pdf
    • http://viethanit.vn/hinhanh/file/pemavukobomiw.pdf
    • http://kangs78.com/clients/66216/File/lugezajuperakabufelu.pdf
    • http://www.eventoptik.de/upload/files/gatozinanewi.pdf
    • https://pacantioquia.org/aym_image/files/80050747682.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094b768ec2c4---31655795200.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/886je3rcqt0cbdhk6c0g8uf097/62481681077.pdf
    • http://boekenwinkelindex.nl/images/uploads/45187477852.pdf
    • https://abeess.com/userfiles/file/rebelofonef.pdf
    • http://ed-web.cz/userfilesfile/pafevifalejidikeguko.pdf
    • http://backkwang.com/userData/board/file/dinaxivipebamurudul.pdf
    • https://alice-immo.com/userfiles/file/82371656249.pdf
    • http://fairway.cc/images/blog//file/bejiwosuku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+connect+craftsman+assurelink
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 16792 bytes
font_01_sfnt_off00010462.bin
c6c8c15e708853a9edbfdb314a6bd6d15edd340e3aa206b2348e469123794664
pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 10768 bytes
font_02_sfnt_off00011d25.bin
e1f5e543c75a9e50b45758a4b09e38e8087412a6cbc93b27e78ebed5346133ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 16128 bytes