Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb0a10440ebdd1c…

MALICIOUS

PDF

106.5 KB Created: 2021-06-29 16:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0148624ff0db792d151b16441368a20 SHA-1: efedcc0784bfc1723f88a9a3286637155e096d46 SHA-256: 5bb0a10440ebdd1c94e7fb5509691835f0bda91fa387ba266d7b55179ab5d9a7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jopit.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/18749739283.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/efee740f26b57a080561a30e7045be0b/35559795432.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7d349c8b54efef165bcdc341747bd54b/befojarapones.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ba1c8066fdc787551a5b4d5e3caa2985/remozupilogakonib.pdf
    • https://tortugafilms.ca/adminfiles/file/70905750478.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/94253467635.pdf
    • http://webbuilders.com/files/file/puviwekaretakapabeg.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6d1a15d41d0ae4f651530b06c52e0ea3/xinura.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/70148074096.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb7247ac1---kimemiwefumababe.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add333078dc---75407632982.pdf
    • https://twr1115.net/files/fckeditor/file/sekiramazufumosavelep.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ba438664cec8882bfe111fafb27d9b9b/99044356001.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/ninapabebivobiganiket.pdf
    • https://casabresciani.it/uploads/file/kaposadupepufumujuxozo.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2db319482250a2323268265baeffafd2/tulekirexigixexeso.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mt2cailmpadi63enh17bef9ib9/duwadenisamaxuvof.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d16daaf1b---borogevolebet.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1110536139.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=young%27s+double+slits+experiment+explained+pdf
    • 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_off00013652.bin
a9e7a1b187fccfd36204253a0733f3d2bfea43a0945fe228f19b7ecfb03b9502
pdf-font-stream PDF embedded font (sfnt) at offset 0x13652 19720 bytes
font_01_sfnt_off00016aed.bin
c3d9e868f7a0f15f0b442f30693ef3a8c6b0ac579352a56ce89596170513376d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AED 11200 bytes
font_02_sfnt_off000184cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x184CB 16792 bytes