Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0f35e82794bfd4…

MALICIOUS

PDF

128.7 KB Created: 2021-06-20 15:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d0a84a1a4c481f27dc6c179481fbdaca SHA-1: 862ebcaac8e56af18f954da7631e46502a3ecafa SHA-256: 6e0f35e82794bfd4982010a7edd7ff93f59d5d4ef877ef1537e8ecd79610e108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6839

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pistant.ru/uplcv?utm_term=roman+numbers+1+to+100+in+words PDF link annotation
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/76b6049c1ee7d7a67615dcc11f3872f7/bojorojefuwamerivakaxib.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/vubizubinewuwugitawatul.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/wulorapite.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab09e817309---visawig.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/13466160599.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4ce12bd5---60899405102.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/17338220135.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2551b1b95---95302518036.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/27459085626.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/juxisidulag.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/2306688736.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c2ed56bd4d28fb7449321da9cf4b2a00/13698200638.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qmebaacjpqnpa2ucd8cms63gf5/80084046981.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/32539574694.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6d4c1ce9bc90d7805468a7db8ac3dca7/vawowuburemazidu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/pikp1pk1ptckf50v3u6m429d6v/88380048459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000177ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177FF 7548 bytes
SHA-256: a3b3b5e9b1d9af7e062e6d1d6d2f6aa036fb34e4888a23e1da515b2c5c3fe160
font_01_sfnt_off00018b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B49 3072 bytes
SHA-256: b2812805403707e362151ba6fa74d3e7231bc9a52f4117d7447186171edd0cd8
font_02_sfnt_off00019640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19640 5372 bytes
SHA-256: b1027565b6fcc60aa67ad5ef9daa7c1942e871084688fe697765026102819136
font_03_sfnt_off0001a873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A873 2156 bytes
SHA-256: 373cd07e22e53d69995affee6cf90f7eb3b1fb1ce5aeda7bb8f23bcf2e17b02a
font_04_sfnt_off0001b218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B218 15252 bytes
SHA-256: 04e482eb759c6b9d31811979034d182a60649f15a2361d859b7de6627c531112
font_05_sfnt_off0001e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E337 18152 bytes
SHA-256: ee56e421a5563eedeb326e0ed243467badacb1b8fac8abe0f9bba9bd87e6c4a9

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