Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99f3cc09c3a503e…

MALICIOUS

PDF

197.7 KB Created: 2021-07-19 07:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10df9a19316a93f3ea64bbf6e1c28a34 SHA-1: e427ad40c349d95b1f912a10fbafa2a374573871 SHA-256: a99f3cc09c3a503e23aaad89866a673229133cd4b6812ef4f016eb02d30f4d77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier, indicating malicious intent. It contains numerous links, including one pointing to a compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9620

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54f094b4a---bukubovuposafupuzu.pdf
    • http://dzbnf.com/upload/file///36527953328.pdf
    • http://safires.cz/ckfinder/userfiles/files/beraginutug.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3600f9ca32fb91a3f7336f1ca6d705e3/gevasez.pdf
    • https://chp-travel.ir/data/file/xigepoxuxebiwebemudis.pdf
    • https://bandai-k.com/userfiles/file/9899271692.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/58d5vmk4r7tg2g37msubitpfsp/mofemavamapolisiva.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b57c3742---wavagekofeto.pdf
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1316e7d6ea---88424215475.pdf
    • http://gruppocreta.com/userfiles/files/bikugufuwikorobuw.pdf
    • http://cheumst.com/upload/fckeditor/file/74971755117.pdf
    • https://whitesal.com/data/images/file/4247_20210612181256.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b6e0203c9210426b0820ced6009625b5/rozezekedisaworamariwiwas.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5d13fc8475e2f77033d1302d97af3ec1/mivesekogugifo.pdf
    • http://cinebuzz.be/uploads/userfiles/files/rokogoxizujirifarovuv.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d79bd14d---95355838868.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d0945a22---81237305444.pdf
    • http://www.urbanwaterways.info/files/bufapobafabafibusofidiw.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/69e95b787d7001faeb76591e3d7d8ad3/66506946257.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/wepupukomonasud.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/23485931902.pdf
    • http://tiwtactic.com/userfiles/files/23442655935.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/rulokovanojesilogi.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d947dcab---25677279651.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f5d21a01---33903303805.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+road+past+altamont+summary
    • 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_off0002a58e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A58E 16792 bytes
font_01_sfnt_off0002bda0.bin
a93e89e0c71b012982ecee168be28c8583cb3336b89bc3468dc53cfe05a0fc9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDA0 19368 bytes
font_02_sfnt_off0002f073.bin
7b8183e99c6ac71fa1fc7cf11858b22952647aabab7c9369e07b3ba759978a35
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F073 10740 bytes