Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfced0ea0cbbbd3…

MALICIOUS

PDF

69.3 KB Created: 2021-09-12 00:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d6126650fddd9b317f0d1b860329fa7 SHA-1: b8c9b53105e1acbaf3551728b6be85069d01c234 SHA-256: ebfced0ea0cbbbd3cf70ba29dff218363d53ab90c3c2adbf6d5a3a9258de47d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

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://synerhu.ru/uplcv?utm_term=cannot+open+file+on+android PDF link annotation
    • http://195exim.com/datas/files/lolonifalutikaka.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d50aeeed---pufukowezudilixubolorixib.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210912_050658.pdfIn PDF document text
    • https://digireg.cz/upload/dunokakiwana.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/ridotevabotakuzuwuluxas.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/gomogefu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/25793975494.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/53729375642.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/97718636871.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/26841758682.pdfIn PDF document text
    • https://slotpt2.com/contents/files/vawaraxewatunobamoniroliz.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/ropixalegajugarorivizoru.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/vatezubifej.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/tunolasowanogugobupowezu.pdfIn PDF document text
    • http://a899.net/userfiles/file/62532735189.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/16983656511.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/sujafuxaxusojupiguz.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/kuxoxe.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161312cba0df19---76506217045.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131f94cf2d5e---xopomasiban.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/77760930002.pdfIn PDF document text
    • https://suruburi.net/mm/file/20774061577.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/kupalonutugegewedolopup.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/88227437707.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/dubelutiw.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 10356 bytes
SHA-256: 409a4daf97f14da4ff0ef63bdb9b9bcf7ebeeb92208342a6ee2a93d43ef54fa5
font_01_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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