Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcffe80791b36cb0…

MALICIOUS

PDF

63.7 KB Created: 2021-08-14 14:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b4b0fb9c2a5d9d18b425d46b5ae563d SHA-1: d74b224b26091598778700ebb53653fb35438b6e SHA-256: dcffe80791b36cb0eabe7272dc60c65dec599e286a7a029cbd4fe2f2c8121844
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads. The ML classifier strongly indicates maliciousness. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious or compromised sites, likely for SEO poisoning or to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9770

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=dentures+and+demons+2+walkthrough+chapter+1 PDF link annotation
    • http://autavrabek.cz/obrazky/file/medirirukesapoxezakisi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/df975364396806c999b749446fe65faa/80796040769.pdfIn PDF document text
    • https://austarpharma.com/upload/files/kagenakajoperasurazanaga.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e309f37387a---16690043035.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/48o2v7oagf4cl5vk82esno5780/radimeferifigeved.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/f77clehf59cfopa9kia9rv2c3p/35285726240.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cfc6958b2---87327657656.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8883ee279f---96887223430.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/lanaxeguz.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/kemutod.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/goduzuvotipizuluzin.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a66991d780bc6fbc58028c25b71dc49d/83754499611.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1365a1e196---gazonadijuwef.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc371c6e81---xapajelaga.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/91415374937.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/36800178086.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606eefb3dd80b---30319436965.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qdgkeenq6km13itd8lovq49rbh/xenanelujojafodivi.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/42544243933.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ee3e0a0b---dawofupetazaxavusozofisu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bej5eqpmac64b6eg3cn2n9i5v0/33083405551.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/60651f3c77ac7fab9bd19e001b4ea20f/lujilunovo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc55d7961---pusoboniseninexizuf.pdfIn PDF document text

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