Malicious PDF — malware analysis report

Static analysis result for SHA-256 772cc8407e3afcd2…

MALICIOUS

PDF

78.1 KB Created: 2021-05-30 20:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec419d00e59f259d704fd362b0f93569 SHA-1: 7f121e005b35a6868b62a969bbcca49a89c7d59e SHA-256: 772cc8407e3afcd2979a2cba9b59fd15f2b45f8856ff9ceb024015e44783a05b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9120

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 https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0324dadc8c5355f3f57cd432e269fc55/bokomojuzezanofikofekawov.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/2227fac294c8657bd4aba528540d7643/nefipituvutetulenujip.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/oih0u0du3slm3lmbpr2rnniv13/27245560894.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8dc7ef00---62625651837.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3365ce80d---12338952007.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/31dc28b477919690666fc7382e037fdd/45445990577.pdf
    • http://aexpress.lv/index/images/up/file/29374908656.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c61d172385---gapamojunulenatefuvem.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/71f1caf33dedb0250aec39a3f4631110/29907009013.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b04h2kt66tdc0b8jpva7tcd4g0/74472108061.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1386c82096---nejisivazawobubew.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076737042b4f---ladar.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/eb6b268280111026837623d035b5c654/86320848406.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16073763d16fb9---xopam.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607244bb26690---wofomesixasuguvet.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc00100ab---batixosokaravufupisug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=topic+vocabulary+for+ielts+speaking+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9e.bin
0a3404802cc2f8134e41fa6f6113b48b8dadf941eb289a7555e570a17bab880c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 3408 bytes
font_01_sfnt_off0000f8d1.bin
c12695bc17b47a5400845110045a00b5593db12b94b000eda062a9887bb3a6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 5636 bytes
font_02_sfnt_off00010c18.bin
ba85871ba89ac468401d1a6e8365d4b3ee2726025cf59ffc720b9b6c3ae19089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 16196 bytes

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