Malicious PDF — malware analysis report

Static analysis result for SHA-256 723e99b3c334429c…

MALICIOUS

PDF

108.8 KB Created: 2021-09-04 18:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 568f3871c1bca02c88dbbbc2d37651e4 SHA-1: 8685f0e2b161fd1ec7148250731dd05d9111b368 SHA-256: 723e99b3c334429c142acba5864d9c6a0a70e2de02ffd9f388e644dcc472aa6f
224 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristics indicate it impersonates cloud document services and actively lures the user to install a browser extension or update. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site, aligning with a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 9

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://xiaohecollege.com/d/files/8616272991.pdf In PDF document text
    • http://ahxxzx.com/userfiles/202105/file/81172220850.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/32614097525.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/fanalat.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/89161307807.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bab57a47e67---nalumekojegazofur.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/87514fcdace47727d50d66783a4923c8/pudomurojitozona.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/8d0028ec580990ede5fb38173abe87d2/96759421105.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313bcd67172---xatijunimafumo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/96sbhb93b9ti7b5mqfjjhll2k5/42264582744.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/3753388088.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tegobidetuzof.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/64923780070.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/godokowubujuxamefadori.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a2b729e5d---76802847844.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864f8727ad9---razexuwopanapare.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c89d17bfaa1---geleranawep.pdfIn PDF document text
    • http://ridendo.cz/files/file/wikexapi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fa2e4ee25cfca4501357321516ec094a/jifaxupolejezifoxijojakim.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9cfc147d2a399be9644b5dcfd8037bda/weluwabofebobosezu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b966a62fbc---ligove.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68c8fda79d---62244896707.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/29371894857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=compress+pdf+acrobat+2017PDF 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_off000141d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D4 11052 bytes
SHA-256: c37a6e287ec999268abcac83bb9f3854a92239b7e004a13bd4332181f92271b6
font_01_sfnt_off00015b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A2 19136 bytes
SHA-256: eac3ae246e73bb4a14ac66252a5759bba156809cca906a32ef9d2b50f01f57a0

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