Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97d625e41a060e9…

MALICIOUS

PDF

72.3 KB Created: 2021-08-17 14:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a6ab9586d85b79bab3ec643c8949167 SHA-1: 9237dbc3b5d96957efec235a9f96e07533cd7f73 SHA-256: d97d625e41a060e97f4eacd8e33caee9083a5a1148c6f1acfef8e272ba74e5d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely serving as a distribution point for further malicious content. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hp6mblkf144k256j8r5hdllc45/48013111468.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a059d5c0959---dudinizok.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad235a25825---26084110306.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210719_230327.pdfIn PDF document text
    • https://mylodge-naoshima.com/kaxamusolusiwudekewemetu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c48e2c34e---veradulu.pdfIn PDF document text
    • https://invest.pl/userfiles/file/ganapuxoronofiluvewafoni.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/35930208327.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/zisivij.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/92401523225.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/mawutitu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f2662281---35212810114.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/sapuvatigazijejesidaleri.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/17936389554.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac516bb37---93242910478.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea4cd1a75---56221405467.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5vbr5tajfpgi2b0b7figam4180/verufor.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/41234847738.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/xiweji.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b30280bcce7c8c937e9006fe90f34b4a/nabin.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/49749131543.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38efbc419---dalagobuwazulugidu.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/jojisidagok.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609b1b1a313c8---87216751066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=muscular+system+vocabulary+worksheet+answersPDF link annotation

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