Malicious PDF — malware analysis report

Static analysis result for SHA-256 838d7581120242de…

MALICIOUS

PDF

70.3 KB Created: 2021-06-01 18:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bea42ec1963a893d6b57d50ce4b41724 SHA-1: b1e716cb70a9e0bc7f67448aa5dd764e66028fb1 SHA-256: 838d7581120242de3cb80cc8e9247e5cf3fb3e4fba4ec47093195259f38f6052
156 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a common technical issue, likely intended to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://krisoc.ru/uplcv?utm_term=why+is+my+amazon+fire+stick+remote+blinking+yellow
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609408567f7db---siwelal.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429197ec8a---23022516946.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0751cab997f5cde64555a5e7e534e206/96135410584.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9b1b5e19159a3a314aa1967d2e09d310/kapurakomexezuwusulenuzi.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9skmr32vlker618635br7vrvhd/tejorebivakoresiput.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c36646371---rotalobowor.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/k9551plhq9hr4s5bjv4sac4pu1/81656212594.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/31254216eaa091b41421c34e4139d37b/17391168204.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b9f17b016e2b2ebf71c7a4bc0b3d8342/nosuzujubis.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609468a59e5a1---51232019274.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/6105fdf67e00fa219319013f0c2750ae/72193156161.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/j54va5da2vdkhclqu3d2fb1e62/petek.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5b4cab8e---58385777227.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e8ed3177---bebuvifiseguriwi.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf0677bf5c---87846083367.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d8.bin
cdd5e2a4346343dba725b0eb800de952374f2a0e9afd313af4d37afa0e478d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 5544 bytes
font_01_sfnt_off0000e6ae.bin
63b4eaaa47e163d17b0c888a969e46e736ab30d8ba6908674c355e576bc3500e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 10716 bytes
font_02_sfnt_off00010b50.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 4324 bytes

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