Malicious PDF — malware analysis report

Static analysis result for SHA-256 4900dd9f0e7c0658…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 12:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb2f107d988956aa49a3c07b4c2cd370 SHA-1: 73f9f8200b9137713e8b1ee529a6ef30aef26768 SHA-256: 4900dd9f0e7c0658d5191eaba774d8935d4e0b7fa758629c9ad86f7cd94efcaf
252 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple links to external PDF files hosted on compromised websites. The heuristics indicate lures for remote support tools and password-protected archives, suggesting the document is designed to trick the user into downloading and opening a malicious payload. The embedded JavaScript likely facilitates the download or execution of this payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/b9vern99d25racd8nc6jsmejtt/dofajunukebuwoxume.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h3b7aqt0rgk2ld8a3m6cb6fj81/lupibi.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/mexazaputopagubunami.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/lefagojatifosafu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8fd0c216eee87fe4eacaafb109b43ac2/39134174684.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/80433077093.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/tifuxat.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/9926891455.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/2290915056.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/3911549876.pdfIn PDF document text
    • http://snft.ro/media/file/29996966080.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/pizizagororoj.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/60455505043.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/78892798932.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vedusilufosuz.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29e55ebc7---86359707764.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/88627387222.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7fc40186382beb68eaf790fa05a6ad8e/nepugalesavovibekoga.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094849e5eb83---86480783599.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/97126131798.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/k7ahcchabsdulbvrj4jjrqiecg/71773016504.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/wirujirapimafodibenuzajak.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/17410757816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=remove+pages+from+pdf+adobe+acrobat+pro+dcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 17968 bytes
SHA-256: 10e38fd316b898a28aa780d4d014e8190ca266b917cba4eee768a8995b61292c
font_01_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 10972 bytes
SHA-256: e7339b0c9d81f7d964a3f9ade3457d19e30769f183957e5c2825b6a9d417ebf4

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