Malicious PDF — malware analysis report

Static analysis result for SHA-256 79547eb94509a8fc…

MALICIOUS

PDF

73.4 KB Created: 2021-05-18 05:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83bdc42b134a2498ae2b3b984ee8c761 SHA-1: dca329e85c481ed85daeff28415dea4cb64f07c3 SHA-256: 79547eb94509a8fcd93722d898569c66de620224a17360a1e4633b74311964b9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8079

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1eb53daef909730920cb8467defa5d25/72983616743.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/75084672238.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085edd33b339---62297346462.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942dbe1d1ef---juzosijidixojos.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/85a546adf5a8dd53f39c745bc97e0000/dolatazezigavonumaloki.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160861de6ba6ef---kunukerezi.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0215ccddff1163e7ecef465d52161c32/keboramuwidudikegewimobev.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c804a688beb08b9973cd0aa30d0d11c9/35498220496.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a05ce7df7f81ec35332e156a62cb9dda/77372152956.pdf
    • http://arohitourandtravels.com/userfiles/file/63278663908.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d85a6e652e1234e2d6e3b0fbb4fc5ff0/47145586105.pdf
    • http://arcomproltd.com/userfiles/file/gegokuvumekodixu.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b239ac5a3---19158018139.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8a8133490eda5a1d20640e977a685165/neriguwilajedi.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82648d3eb---21379996134.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b3dc46bfd5a19136f263d0bb14df4c68/94433014517.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=shrek+1+movie+google+drive
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2bc.bin
2b8a7399c52bd4b56c50fe6cc38a16b5ec2e973ff8b2de96381d85bdf3c1e0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 5128 bytes
font_01_sfnt_off00010411.bin
b7a1d1da4b1e3ed6f62e809e222c5b14cf80502ce77e138996450e78df98f573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 10800 bytes

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