Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea35c861234be7b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 02:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1be91bc6a1d1ad25cbc24a0fab963def SHA-1: ead533676dd03db138785f5b7c94f46737d38e34 SHA-256: dea35c861234be7b0e800faf0dc4b0191a84211451fff655f77de942262387f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a phishing or malware distribution attempt. The embedded JavaScript likely serves to further the malicious intent, possibly by redirecting the user or initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://tpk-m.ru/files/file/niwanabegisu.pdf In PDF document text
    • https://paramourpourbebe.com/userfiles/file/59718451357.pdfIn PDF document text
    • http://sungder.com/upload/dofajitufunob.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/42020198107.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210915_508859053A8CB8BC.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/38574667091.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/dolivunolasowiremavatat.pdfIn PDF document text
    • http://17njl.com/userfiles/files/5882841045.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/45291342843.pdfIn PDF document text
    • https://bloc-immo.com/images/wutumokid.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s8uo2q5gq1penkg9cg38j8og11/68678380608.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/gewusupojegebet.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/kijaxomo.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/xozaneve.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/31527923163.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/welurafitepamoxeni.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/24604135000.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/buxuzegerofakaj.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135358be5d2f---14850884211.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109070513294942.pdfIn PDF document text
    • https://gulamanis.com/contents/files/dulibenukujow.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4fca0744---88387557726.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-19/images/files/32125996582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=final+fantasy+7+iso+disc+1PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 18408 bytes
SHA-256: c8090fbd36cb5c24869a0d58aadcf9ba51c2fcd95a564c4bbcfef83220ee8fa3
font_02_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 10432 bytes
SHA-256: 4f1ce08c4f3c64c9dd0c23bada44c00400aca204881f0e9210c72c0a02f20ef4

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