Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8907bc5444cdb3…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 20:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5573014a16ccf2aab8c44bd78fbf969f SHA-1: 2a34230e215f57d9a2a0f89aa545a1a741ef6761 SHA-256: ae8907bc5444cdb3ee25ec4bc35920578def195b076beb298b24eff1c2cbe550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/dv2ijquopq63c5p0s5knoqp0ks/14477477572.pdf
    • http://yule-sign.com/upload/editor/file/20210721071503.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa82e7078---vegag.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/p1uorhbu4cdihifc329vvidj01/31392549656.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0svbfd02a6vn5mab23gigc11qt/97572610209.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/985198592ce5297ace4c4f78824964dd/85613689471.pdf
    • https://blnk.eu/userfiles/files/40728701796.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/xefazazaluma.pdf
    • http://nacyc.jp/Upload/file/fowabetuloli.pdf
    • https://powermailer.in/userfiles/file/70093570493.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160867a3f65b2d---98849378922.pdf
    • https://zzhqhi.com/d/files/dutamop.pdf
    • http://videofilm-tv.ru/content/File/fejeviwokerikosusotanage.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/520e4e426cc62f0f63e758ce9ee39017/3301626833.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f1dd13d41d6f111d66ac594aec28e518/27738418765.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f407b8058---79588520810.pdf
    • http://kingcraftviet.com/uploads/ckfinder/files/53771596877.pdf
    • https://aokman-drive.com/d/files/nafijinareza.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58e313c9b---zetisawuvuwuz.pdf
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/nisofinatafusujogugawago.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0qs39chmu372ltpnipu9a85c4e/mikomutagonive.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/megidexe.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/29edc3e9247820e51fddd02242d5a43a/68203159829.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078880e8aab3---14621227444.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+dry+curly+parsley
    • 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_off0000ed9e.bin
4499acbad2af19836567d59aa01b0d889e79feb3e8822a64c35478dd85c596fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 10604 bytes
font_01_sfnt_off00010612.bin
f04e150a272b08e8c6c28cb4456aa1b53deb6bf572a196cbe8ef82c6ea4f9373
pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 17316 bytes
font_02_sfnt_off00013295.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13295 16792 bytes