Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e05cfeeebca5072…

MALICIOUS

PDF

77.7 KB Created: 2021-06-27 20:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 37e8c1a2030390cc3c978515d2ed882b SHA-1: 4ee92ad9373200522487e3dcdcc31aabc9e9433a SHA-256: 2e05cfeeebca50725153206dfbefa07604fb9d58decb81e2647651f34c16458b
132 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also hosts a link farm pointing to compromised WordPress sites, likely serving as a lure to download a second-stage payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely attempts to exploit vulnerabilities or redirect the user to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 6

  • 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.
  • 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
  • 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://smidgel.ru/uplcv?utm_term=windows+8.1+media+creation+tool+download PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b26315e5---xitabem.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/20814059175.pdfIn PDF document text
    • https://raljob.com/userfiles/file/mopopikisikuxadogojopapin.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce4f0fdbd---8317871682.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/1jd8vcadlenpv0kuuegkgbcct3/tobuzisajakipik.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/69771256186.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607766b835c2d---navenadupulofud.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d2c792edb9d34604f59e20cc6539a3ce/fegikotasigudamaligix.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/36512784782.pdfIn PDF document text
    • http://anupbolivia.com/images/files/zesibegasoxoze.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f878f0b47c---18063892733.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e43a6ce7ff9300ec9ef14502d170ef9d/88946620050.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea8c09988---43600224246.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1320d4c453e821246f11c80c8e1ed22b/weximebunolezotuwazupug.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b128825807b2da3a79f023838d8fdd6b/90110344028.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834c149e13---nolemefod.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bae44a6c5---fozagox.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4ngu9gcv4muiavqah65q29grm1/7106461563.pdfIn PDF document text
    • http://0930actress.com/files/files/17389318233.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/69a3913c02c212c7d8a3b56058c8d859/xesefadajipe.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/63042310253.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///kesivowofepovaj.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/rotowafomupesi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 17180 bytes
SHA-256: f0aef434c23837c59d7cac3d5eb16847d0dfe03a4eecdaed441645114a05dc0d
font_01_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 10936 bytes
SHA-256: 5d6a7c7b9a47b23c8231fc40a2b04a520b36a972f9af08c38b8bed3b3ba36f41