Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf114ea0de0fe594…

MALICIOUS

PDF

87.1 KB Created: 2021-08-05 05:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97dc5f56cfd57bf3bce1636ce98f462a SHA-1: 33eb86e2b198b6aee5e8a911ca00ab500698f7d6 SHA-256: cf114ea0de0fe594e94fb0a3a5c3a9aff378a57997ad5c2bfe0d9c0f6078cac6
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. No scripts were extracted, but the overall structure and heuristics strongly suggest a downloader or droppper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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.
  • 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://hagepoorter.be/files/files/18378863386.pdf In PDF document text
    • http://huh.hu/UserFiles/File/funul.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/fenadum.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/tizozopezupuwo.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/gawizabu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c600001ded9---zukas.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/1733326952.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/10873392033.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rs2kk1sdsi0gsh7b6e3rcaaa9a/jepobaketonikas.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7eba8134---fixokovulirowarosati.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/16670341852.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786b288dd3c---suwaxenig.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/70813689139.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xulor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9a3644e2---serusurirobaragulelajopi.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/81480218453.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/bebilazik.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d41dbbfb5---1302902268.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/61b0563934d2cba0a3325308c617eabc/18109785056.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d32fbbeb877abb3186d84d0c18abd79b/62248989029.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1db15459---refurorikunizavezi.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/wuxenuboduvexukabenejike.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607eb4c910c43---wedomokuzubula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=baixar+jogos+psp+para+androidPDF 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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10576 bytes
SHA-256: b25e2ea43ee30c8bc1e712476a5318bceef0f4f74396ab2565e4747b30d8c07d
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 20028 bytes
SHA-256: 72fb6ba89bb16a8e172b569d9c5359d0ea87e111f6fb3b0060571ffb9f0fe5c0
font_02_sfnt_off000134e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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