Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2438ebee7f2e41a…

MALICIOUS

PDF

81.8 KB Created: 2021-08-16 15:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27f618ed361c6605a3c4f0e6ec5fea35 SHA-1: aab1ba5d5db4c1d6088af3378e44eb4a4ca2d5c5 SHA-256: c2438ebee7f2e41a0f2e8da21670df27c6392abeff396e899a85c1715182c472
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a distribution mechanism for further payloads or phishing content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of using compromised websites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

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 http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b54b255d---tiliwifabidudonajumikad.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb5b7f2f2---pedunu.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/31712817478.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210723_5E91E1E9A9457879.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/94167785957.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/dinoviranusuga.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/kuxewikukomabetesuxes.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/4012853059.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/39777482490.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/49957700341.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/21836602365.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/remepababenovifu.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-06-26-16-12-47-NLzSA9TL.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3e6f4a133---41995254370.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ef46d75e3---39924198507.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9b6a9749fef979c1d9fcafaf202cb4de/kugagiti.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/69ba18e965c43a8ffbfce7a5506cd7d5/40602300307.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tejazibalovakukurused.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3e5c26dcd5ee4bffdc058835a742fdc1/metojad.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090586aa1de9---wakadovinev.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/74459450871.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/48662284351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=exercices+pr%C3%A9fixes+suffixes+ce2+pdfPDF link annotation
    • 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_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 19376 bytes
SHA-256: 41450aec7dd4dfb9097b4dce6969192f60e500bf4f241c6fc7bc7f7832528304
font_01_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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