Malicious PDF — malware analysis report

Static analysis result for SHA-256 92df6ead498d0de6…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 00:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e3b43244749309cfb827c9f006b257c SHA-1: d56d4a556351d2ce362cbfff831e973749fc678f SHA-256: 92df6ead498d0de6b69277e3874c08cf4f513ed641a4efe0a1e24c485add235f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://infinijewelry.com/userfiles/file/3128823433.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64e7429eb---82212741416.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cb89ead01d0ff889a323b25dc82f6a74/5731623175.pdf
    • https://kisikana.hr/userfiles/file/80167399588.pdf
    • http://reginahajo.hu/_user/file/28863523255.pdf
    • https://profm.hu/files/file/mumijunemifig.pdf
    • https://5703n1n6999-6a55.com/contents/files/13435940835.pdf
    • http://tokstar.com/_UploadFile/Images/file/rukowalazevulapi.pdf
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/gokosunizajo.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/jademerawizufal.pdf
    • https://hetodon.com/fckeditorfiles/file/ramisefanupewafafig.pdf
    • http://asijskepotraviny.cz/files/file/78766153775.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/91297370760.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/76798050437.pdf
    • http://olgapolyakova.com/files/files/54873445634.pdf
    • http://carsonpokebar.com/uploads/files/50131950495.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/galagunanukava.pdf
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/67061492978.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/ledalexafenilijesupo.pdf
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/92632266926.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/eaeoajs0t4l7ot1k66dinlvbh2/kuxedazivudajavodopi.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/fabininula.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/wegutirakuxemadipiline.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=real+estate+agent+referral+letter
    • 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_off0000b0dd.bin
448495fc3219b0c613f157f0a18e7ba5af11c167bcf655c24063d8a709e280bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 17340 bytes
font_01_sfnt_off0000dd5d.bin
8a69b24dafc6cbbce6b15193830e1656026af689dbd2394e933937d55e2b8396
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 10224 bytes
font_02_sfnt_off0000f477.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 16792 bytes