Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecf8568cf0f8a05…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 00:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5a0e6996480f48f284d45e120f0b1b6 SHA-1: 38b747d0489e910c4c49c1dcdc1ce07987ef0777 SHA-256: eecf8568cf0f8a05af96bf3a345b8bca33a988ec0edd918e27bbf39a29646239
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using such PDFs for SEO poisoning or to host malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8531

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://polaryachts.com/res/wysiwyg/file/rarige.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf371245c---jamisoguwol.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/guzuvivuniwenapebari.pdfIn PDF document text
    • http://geoman.cz/data/file/683219742.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/buxozukubafojifitoxelolun.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/7447816360.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b9ab3990417633902ff676b6584cd4d2/mufupofizagisodefit.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904201649.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/81922703579.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/gewipovimara.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/91430696878.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f345171e1b---42594641271.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/24583861960.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/29618950990.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/lipurerewunaju.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/womoxivu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/91e27548457e46ee099d57b151eed4c9/61445567555.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/92642858920.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f72a6fdf0c2604c1711ef0fb17d19574/sunowaxibikufomojeker.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0mlf3ddhto5u5frj311h2hprtu/xifadiluwis.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/20065277814.pdfIn PDF document text
    • http://coolscape.info/images/files/25329780057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+live+wallpaper+iphone+tiktokPDF 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_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 10584 bytes
SHA-256: 049a8cd352d0c42d7ecab516d6fc6c8cb89495f32bcf44fd14671a76547db21f
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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