Malicious PDF — malware analysis report

Static analysis result for SHA-256 6190d90986672067…

MALICIOUS

PDF

86.0 KB Created: 2021-08-14 22:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97f30cadb1b23b3f219516d32e67943f SHA-1: 408b959f4bf3889b49825c1ab9de7d3874e8c744 SHA-256: 6190d9098667206745e0d32bccd3b4fd8a99b8f540c2f5b2ff7507c7e35798b6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness, and the heuristics point to a link farm strategy. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://deltools.com/userfiles/file/91160379557.pdf In PDF document text
    • http://stylowa-pss.pl/userfiles/file/97340139816.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vl3hm7grdu30n8bn1hj9p9g8c7/kexixifokamadizozubarat.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11f69477f---ropefukelub.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/7b5d902f5c65e0e44da27f45d631ac3f/46979733830.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/51376755254.pdfIn PDF document text
    • http://lyshiying.com/d/files/xisup.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cfb76bce543230292a12d338654d6c80/sozadud.pdfIn PDF document text
    • https://susta.vn/userfiles/file/botirozifelupudolozif.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/36996247056.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/senetipik.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dtocnpidaqs5tf2heqt09icivg/65351875174.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0cc0a7f12b469f821eeaf96376de4bb5/fojutejeviwuju.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b336cdbf0d---74928060741.pdfIn PDF document text
    • http://chieucoingason.vn/files/97707634650.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3riehm95j2959ih15j1olmht5q/womaxovakazokusufuze.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/ruwowitorepelatamovovon.pdfIn PDF document text
    • https://andrejc.si/files/file/nawanegavid.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fowinoledolej.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dn994rto0hf9ipa9pch67g90i0/falaxuxedezivatiba.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/suriniwavasa.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c66d495e2707201f15713418f61c1e37/13400593952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=immanuel+wallerstein+capitalismo+historico+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 11024 bytes
SHA-256: 010fd5b058bf92ab28216850b59e45b9287f47c90b6df167e5df63078c97617c
font_02_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 18428 bytes
SHA-256: 67deada3fa1a072805371047badd514e82f7ee5d2249667429261b15fc6a8b08

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