Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e6211578a5589a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-28 01:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5018a3a24345333cb5714f7b1bae6304 SHA-1: b0acacd8abb80cca5f7a899c2d7b8084386224c6 SHA-256: c4e6211578a5589a8cd2ee9f6f9594ee2f3822e429c5e39329a0a22c786c637b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and malware distribution lure. The document's content, though heavily obfuscated in the provided excerpt, is identified by heuristics as a 'Browser extension / update installation lure'. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting an attempt to host and distribute malicious files. The presence of these links and the lure indicate a high likelihood of this file being used to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://airconbank.com/upload/fckeditor/file/ridigirixikumabune.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a99dcd618---94262007751.pdf
    • http://verynailscm.com/user_img/file/97532895126.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc54010c30---97656471427.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e45c7c248---23470749554.pdf
    • http://all-pass.com/folder/editor/file/raguje.pdf
    • http://jirehenl.com/userfiles/file/010231419821.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/75604416271.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/abb272eaf20599da834ebb0e15c79e44/vejutamufaxelubakufudi.pdf
    • http://winhazel.com/indigo/ckfinder/userfiles/files/7205734650.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b9c2f4b0f26be2ff7c3f7e23597e211a/60936134677.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef34525cb4---50204025009.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/r5o6rkmnco1uidrjh576q41jf1/95465078660.pdf
    • https://mytalk7.com/_UploadFile/Images/file/84197147579.pdf
    • https://harkakotony.hu/UserFiles/file/26015067957.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qs07nbmqjagnn51l9rm70kk453/72277770042.pdf
    • https://burstallconrad.com/editor_files/file/22905182850.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe48eaee0---20725594692.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be33e919d68---77852837930.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/0m1hmf2i52l7kvssh4hos0bgoi/mapozipawagimawipufa.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4707071e---jivumu.pdf
    • http://phongthuydotho.vn/upload/files/jonovinazibu.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/mimuluraja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+apply+icy+hot+sleeve
    • 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_off0000efa9.bin
bed4f77158a85c1cee64230a84d52004988f92feb0b02feb6d813a417a3c3e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 17624 bytes
font_01_sfnt_off00011e26.bin
caee85aec068bee3379ea36c66b23f5e01ea884b3f1ffa1e9041434788272da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 10524 bytes
font_02_sfnt_off00013658.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 16792 bytes

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