Malicious PDF — malware analysis report

Static analysis result for SHA-256 95dc402559ac2066…

MALICIOUS

PDF

77.7 KB Created: 2021-06-13 00:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 21c3a5cb1f229c1b32af93d195da7099 SHA-1: 28e91eb12af5ba8fa1ea128202a7b85c7a229af8 SHA-256: 95dc402559ac2066ed2e7de29d63ddec1bca029852a193e57e4cd39b58295731
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 0.9039

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://crysiq.ru/uplcv?utm_term=passage+between+rocks+tarkov PDF link annotation
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7084909f9---77696410409.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/89406188883.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fd12eecce---72565768650.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076e760dfebb---najutetukavok.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f51b7afc---47462173806.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vefexuxumetewoki.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/8687d74682d932e7c13f55cfa2192320/30944047753.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/9093a3c020a8830108b5ca64faf4c792/65787043291.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/090400092886.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/nenumawujomobumobo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/vevawumarak.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c154946d7871e96643f1133d2085d626/bagemeri.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52195d7bab---95575473704.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 6416 bytes
SHA-256: 2a69545f8a9d104697b847a0f548493cbc920d2d91a2c508c9ca03512f8941e1
font_01_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 5292 bytes
SHA-256: 7a9f4ab5922b75c232ee0c4099eb168007a8d0552b3b6f5bfa512b16ddd773b7
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 10668 bytes
SHA-256: f40d0f8efe4549f424aecc3ffdcbe211b6bef52254646f4a38e00db69a7327f7

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