Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2387452d9e090e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 08:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfdbf242a091c53506e2e43489c66a42 SHA-1: fa2a92899a9f96d9e8c600e7bff156be8fe5e8f4 SHA-256: 6e2387452d9e090e1844afac8ec1f57fd0badbfbb4e55ba641305ce3f5b136b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://livre-d-art.com/ckfinder/userfiles/files/sojenu.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0cde779c---tekabefamelojikekusena.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a16485062b5---53322221014.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/jowukototekonisoro.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ccdcc42953915a170124f9af1311e373/safanobikopabuwa.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fofujoxuzifuziragogefon.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/samenegopazaz.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/damuzotadofakitagatexeg.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/76136963730.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a656a5ce7fd---zobizugovoximexo.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/42140799302.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3e7076aa---kipixigu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c8525e2583f46f6d006fcd063ea4f19e/79478956508.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/sefowepip.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e3e7de4d56e8f2c5c746c17ffa8b1d97/karesenutan.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/552b62a0bbb0ab674be3d64a764b5bb9/47792411511.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a02f579b75396d76605230edd3e63392/jatejow.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/67973290136.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfaebd44dc---72502487947.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/2962492323.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a103d5c8a13---11176950698.pdfIn PDF document text
    • http://drironcat.com/images/file/vugasetuwekigumalidagu.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/89367031955.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/bodow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bush+the+chemicals+between+usPDF 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_off0000c5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BB 17404 bytes
SHA-256: 42d89d1f62dd88b3ac0969e08831d74771f591736578ebe2b50b3845b0f52ef3
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 10656 bytes
SHA-256: 5c73deb2d13fa4fdec68e774ef2adbc17ee8ab64413ed92936c5e75992d4419d

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