Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b253f18b9508d71…

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 11:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a7b6644c63ba035f46f893967e2881f SHA-1: 329918c93e2fb8a933548bd699f5a1f8ce10d9e2 SHA-256: 9b253f18b9508d7119e0fa77e9dc44b904bf9c7cbf9c83f4c240fcfc12c59849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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
  • 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://smidgel.ru/uplcv?utm_term=have+to+pee+often
    • http://2478.ru/admin/ckfinder/userfiles/files/32873551333.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092be7f2ec54---27977392122.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862090675d4---4765021009.pdf
    • https://easy2ticket.com/upload/files/zirojani.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607430a12f129---voderob.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad8fedb31---fudebotebup.pdf
    • http://petukmahaaaraj.com/userfiles/file/53053734219.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79eb98626---nunol.pdf
    • http://amirafouad.com/uploaded_files/file/rujezudetesejopuboxagotat.pdf
    • https://aimhc.com/userfiles/file/satupavu.pdf
    • https://cochleartudaskozpont.hufiles/letisafaxubox.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9a872a4af7501d8011425461a65bfa0a/77813570865.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/rj5vd6thqqda6kuf1bjcia0p72/renademuxebom.pdf
    • http://videofilm-tv.ru/content/File/1219274049.pdf
    • https://ratco-hardware.com/Ups/files/64183562467.pdf
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/zuzit.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/343e0a5be75df125c41af304809f41d8/63540885744.pdf
    • http://forter.vn/hinhanh/file/98225025652.pdf
    • http://yfatc.com/userfiles/file/sobuzipolipinuf.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824f5996ef7---kekoronifaba.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c90034730---12832390649.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/af4c9ae212a0b06d7dda7e111e66c312/lasaxezedajanadusesesejag.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/8b3d72b4232180544ef7133de50b8726/robomuzujefugaxexu.pdf
    • http://richmediahouse.com/admin/uploads/file/pakorupawofiloxitupeve.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba878840854---wetak.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791fb7ece62---48015192191.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 16792 bytes
font_01_sfnt_off00010372.bin
5fe2b0ad45d69c3c7ddec0978b5524771767347c7cb4508863a60a1ea7eac9ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 16896 bytes
font_02_sfnt_off00012f9d.bin
f368fda36c6b5b3a31c339fad38ddbc8a6db089d1b234eb937803dbf901ebb5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 10000 bytes