Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b449c58f6f811d…

MALICIOUS

PDF

91.0 KB Created: 2021-07-01 09:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4500cd148ca903549ab7ad298f2c82c SHA-1: 9d2c46ecbd97f91541c26898d707b1c089bd3840 SHA-256: 00b449c58f6f811d63eaeb8d45196c2e94a1cc793bda844d935d9e47d7ce643c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document is a link farm and a lure to install browser extensions or updates, a common social-engineering tactic. While no scripts were directly extracted, the nature of the lures and the detection suggests it may download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc15bc76c1---94841632244.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/aba9oe97va1c0jr4rqe9f1p7lf/28022618506.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b08b5d5df72---gomuwadimumu.pdf
    • http://cristal-in.fr/userfiles/file/suwegizewete.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/790241e7e214760d27c6e1059aa1a0dc/72969648798.pdf
    • http://iswii.net/ckfinder/userfiles/files/mezajumuvopilije.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a67722085b4---zonixenakejoxu.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d5e4526ae9905dfe4ada0620f8e7521f/pedokijolu.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944eebdd1e0---fikemusewux.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087b368b374c---libumubab.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/d4f23938c68812f79196c1f82d51d17a/9992041312.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcbf33d880---59874190455.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/51632947629.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a694a857d---99998076957.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7qaf0meel47n8fv6efk7k19nv6/roziw.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/vgqr3gqr6fvd4sflbp2cqgtj01/mefedaz.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/mesubawilujazizimoku.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96e86184c8c6aeb96b9ded227fdbe898/45764614391.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e80a8e9dd76c58886ce13045c2980954/lizula.pdf
    • http://villa-carlshorst.de/sites/default/files/file/sepabasepamiteb.pdf
    • http://backkwang.com/userData/board/file/51858484677.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/9fvfj2o0el3u0bk4rn1o4f6pg3/seduro.pdf
    • http://redactron.com/userfiles/file/xobowusoxajeg.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/64etslk3vlpoad0lhqpvd9fj0q/topuza.pdf
    • https://al-farh-iq.com/upload/userfiles/file/87363050490.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/eb468b9f33b1f14fc96fc40e9cfb5abd/19011216458.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2453e61b---93279459205.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+setup+chromecast+on+tv+with+iphone
    • 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_off0000fdd8.bin
e65e4a4ed0d6a7ee22f291933c87d44e17213d77d9afa61659159671b5a5c583		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10836 bytes
font_01_sfnt_off000116b7.bin
14c620daffbfd486b213be400c6e46c8bc87e61b820f12eb80d605c47964bb50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 19040 bytes
font_02_sfnt_off00014604.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14604 16792 bytes

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