Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c11dc30358aa6a7…

MALICIOUS

PDF

93.7 KB Created: 2021-09-08 00:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99c3e429048114a317a453b4b87e9e3a SHA-1: 7adc890b93bcee7a852fbaaf60b7ce1300c01af3 SHA-256: 1c11dc30358aa6a79b06e48e80cc21efc2ce2f6e867455b1e4e85499698436a5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a PDF phishing trojan by ClamAV. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links indicate an attempt to exploit users by directing them to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1197

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://szermgrt.hu/uploads/ckfinder/userfiles/files/xolupejoputodu.pdf In PDF document text
    • http://ge-mak.com/files/18222788801.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ee05eb23---wenejaw.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/76264904283.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9828daa2989308d37be0049cb49191bc/wejus.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/99127534503.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7b6b7eda7199b7a877dd1e183cd8cbf4/80269865413.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/5859036266.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/311b7391abd1616e8f43fad4a0b97e05/36904558457.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/15821ea5b337dd19112429d0efe6c2d2/64930110446.pdfIn PDF document text
    • https://steammining.com/userfiles/file/19659327534.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/71613749852.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210613_202226.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c144b1cc2d2498e6042d56879973bea0/mejijuxoxuremagetuzavub.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a338be76e47---16234193119.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/15130323264.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/sawonopibexekunifobi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0b51445111aa9dc744c6ff1e4a82cee6/jojebigozidoxajajigese.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/78333226709.pdfIn PDF document text
    • http://abnicum.ru/files/file/35095170691.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8fcccf16e37eb85da445bd6d6b024519/90938198213.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/muluzutana.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd3fec27aa---sitowusaguf.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161372db3a2fd5---21835127599.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/l31cqsv2ecnddgjjf8r3ntlo3m/15898295108.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d242gssqjfalc9ov30v4sv26q4/61496596858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=saline+soil+management+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_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 18368 bytes
SHA-256: 1f9a59d0b8ad6418f6ea7b50f08e5baa014d2784e67dbe07750ce293a2b4fa2f
font_01_sfnt_off00015e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E38 10816 bytes
SHA-256: eb2401d46e7ba327c9fc0cac164d9b08bd11537e12db6e41387c79f3ea2f89fa