Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6baa864aa3f399…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 22:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e846517c1fb573929ea0da0990eb8257 SHA-1: 8d7d136f554bc8b280724c52e12686bbcbf1f9a0 SHA-256: ec6baa864aa3f399b4f9a1675138bb5977034b936b527321eb633f993786f3c6
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm its nature as a link farm. No scripts were extracted, but the sheer volume of suspicious URLs suggests a high likelihood of malicious intent, possibly for SEO spam or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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 https://nomylo.ru/uplcv?utm_term=electrothermal+melting+point+apparatus+manual PDF link annotation
    • http://lg-palette.com/upload/files/finivifof.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/76553617154.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3065da822e---46455835170.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/67138585470.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/eb1231f18f9c7f147103a1f43f0b585e/94024716661.pdfIn PDF document text
    • http://lactopad.com/uploads/files/45885381197.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/titixotanoveranigakula.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/96227883237.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/r26519os2rdeep8en5neasd76u/talodisatitepeson.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fibodetusunosiwokunilowej.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/mimosopujuwuzofemo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a61df1c3ef50e07cd32e5588d3e85ac4/bukizaxuronevatin.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/433781763.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/41112433653.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jrvb79ja2pks7ko919or40qrs4/vixelenegugaju.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/25/risobu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc17920f168---bifuwiliwi.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/41583634491.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/77692681409.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/64216881786.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fc98ea01---3377844534.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/da657f812c41c8da4be6ccc3aa89b47b/zisofujibinapase.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc6d7515c6---77919881421.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 10904 bytes
SHA-256: 634b668732d705a18f69a55fe39633fd40ee374b48f537cadf4ffd65fd6a92a8
font_01_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 17272 bytes
SHA-256: d2d970445fb8f3d1c189543302e8bd32c213b4b7f44698d904d6cf40a8d88a80
font_02_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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