Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4eee0613cb80b8…

MALICIOUS

PDF

80.6 KB Created: 2021-07-01 12:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c09069bcef64a5d32800d8164d7737ce SHA-1: d0d8c53e09e8b78cc6d623d1da1549d9ddbecb9c SHA-256: fa4eee0613cb80b89109b77783fc629652cafd5213a18cf3f98ac3f7acf3879a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=iatrogenic+complications+definition PDF link annotation
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c7383772a08610549480a995ef4dfeb3/vexebuwive.pdfIn PDF document text
    • http://aplus.to/userfiles/file/duripavejinasetasod.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e20c7d87a---kunikuxepukutovumuzoxuzo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fifexowavodemakujunakelu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71fb9731f---miximugawusamuguxus.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ojvj6ktmqncc6os31chjqdun8l/poramejowamuludaku.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/kewixuvotavekotiwukupodiw.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4e8e651d8fbc28f8f08facdbae62c47d/85444278504.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/wodarirufarad.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/52816114324.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tilawutegoxiwijunutofi.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6f3425720c540e28a44c0e35a1c2a4b2/tubum.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8db8ee50f3---rimorefawogugudut.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fajamuvoxofagisa.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/kefuperebimunikosizuwis.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/673daip5m67uvhemp3tgbjqbi5/nelogofide.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/1ea8531b416cb66d56cd648ae764700b/10605543146.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/db3567ef6cf0ada135def60321d38933/15870453732.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/99986729770.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/25094998080.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5e483944f04e7862a9210240dbeab715/4658616423.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/43aid18ulo18lsablsk6asuoq4/23164197793.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d266c2a243---92787218503.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/40716466762.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_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 19032 bytes
SHA-256: 5d5ba5c1b4bcd694e0e46b0b280be5d561e751aea482fb3e2c4fc602c3021e63
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 10916 bytes
SHA-256: 492432e7ad70ee48ca1200beb5579236a2f1f1ed52004b950e6bdc06ae542134

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