Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60457e71807052c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 14:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d83b191a684ac54d21d0343d3199f4a7 SHA-1: 86bdc66765af4154e64b3cbe17edf9ce3fb85169 SHA-256: d60457e71807052cf216769948f5e01a0af6923d247716e1f6a62015a69f9c3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by a machine learning classifier. It contains embedded JavaScript and numerous URLs, many of which are part of a link farm pointing to compromised CMS uploads or disposable hosting. The embedded JavaScript and the nature of the URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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
  • 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://crewmak.ru/uplcv?utm_term=pokemon+emerald+catch+trainer+pokemon PDF link annotation
    • http://malir-naterac.info/UserFiles/File/nikisu.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/29947081249.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/59963414120.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/5273687875.pdfIn PDF document text
    • http://jucal.es/images/file/15468287464.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/mikatogenopojawogekosuxo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6633e5245---60521992705.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/17996265719.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/mutifizizirubipisamukofup.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/82870430864.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/85797328365.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/5578627750.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210908204521.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/kusolekofar.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/56742092345.pdfIn PDF document text
    • http://sushi-belovo.ru/files/8030681474.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/db6r3eoveqi7klqq86cpgm2r02/35501397749.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/dikepos.pdfIn PDF document text
    • http://storemisr.com/uploads/files/68656883754.pdfIn PDF document text
    • http://profstil.az/userfiles/file/94587258222.pdfIn PDF document text
    • https://slotpt2.com/contents/files/bilasir.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/sukefenobux.pdfIn PDF document text
    • http://guowangcable.com/d/files/tasedas.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/64674105050.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/85621858886.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/bujavijebitoni.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/75e6a9a163912b1fbb838b286d623174/funametupeli.pdfIn PDF document text
    • 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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 10704 bytes
SHA-256: a28f336f5267e9133a8121ba5671c2ae298bcb49894cd3f20f0311882b697c7e
font_01_sfnt_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 14964 bytes
SHA-256: ef19896b245fd0c9fc8eb40bf4c0a913b895fe6268c1d604ec6c83cb6503c822
font_02_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1