Malicious PDF — malware analysis report

Static analysis result for SHA-256 884c8fa7ca97e97f…

MALICIOUS

PDF

78.1 KB Created: 2021-05-09 04:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdfd309e778b3a97968838ae8b6bb0b6 SHA-1: 442b33cedfee5cef9d2872c04418bba7002f1667 SHA-256: 884c8fa7ca97e97f3cc5a6a090cfe8f4bfb4c25510983efc36db19e1a1085d0f
154 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Tamil play kutty movies 2019' and wkhtmltopdf, which may be part of a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7897

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.
  • 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
  • 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://oniceh.ru/uplcv?utm_term=tamil+play+kutty+movies+2019
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb41395bc---67819826868.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/pumezip.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c559dbe58---20962704747.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc7b9f7ac---86975153392.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160810003bc2e6---85888723831.pdf
    • http://akcjonariusz.com/UserFiles/file/relutalaloladefirufi.pdf
    • http://amexeuro.com/an3_Uploads/file/77013215954.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070aaf50381a---xodovewudisimufefa.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb74e47de3---47174597404.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mq7pn5h2s18kg3vleo5m34u1vq/35389831436.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2539828b4af3b5da09c1bdf26fde3c9d/61158873349.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607622701e6bb---41976635085.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072981277203---33106321815.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160732ebd0b5eb---biniwivedur.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc83f3a944---709514415.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718e2b03700---mopazatekofixega.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b6.bin
8a3b4f5ef797b614b80668527e60996711e983494f03c6ccac44e733df52fb36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 5304 bytes
font_01_sfnt_off000114e0.bin
9fd1483c8779d2888e214c9410cdeb0efed73feb129fababe016505c188f2960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 10416 bytes

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