Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f6b9af082c9b27…

MALICIOUS

PDF

70.2 KB Created: 2021-09-22 09:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b177923954a11ada72b7f20ff4eb63c SHA-1: c7631d31ee6bf918898a3ac57a27d6fd26e4c17b SHA-256: 93f6b9af082c9b2756b96074d0ec4e36b471a8e0b9cc0e6ca860a3d3b89e82ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://toocapen.com/files/39273933568.pdf In PDF document text
    • http://vitcongiong.com/uploads/files/wokufubadefilitidade.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/23278552002.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/45334500518.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144ec25dba23---85742667650.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/17850325325.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/kurorosimixofamuko.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/47468141794.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/pufixuzefimowawegulijapa.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/68144604124.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/fixebujaxetijegokafamisex.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349348748ef---78458915853.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/27768375128.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/xitetofaja.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/veronob.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0a5ba14a3d260bc3f20f7a289bea862b/56983299164.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109201612229286.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/pepavejujijenewamuji.pdfIn PDF document text
    • http://bushurov.ru/images/files/bagaxogovofugumolirawobi.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/wawinotowejijaja.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/wapuxivuratakot.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/37194590846.pdfIn PDF document text
    • https://strechybenesov.cz/content/vuvixevejowasojanugusomuv.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/vipuvisiseleputeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hard+pattern+password+ideasPDF 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_off0000b6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B8 14564 bytes
SHA-256: de6279ea4ccf874af4b32e1f7c94309992dce46dd067c4771b12556f7ad566d7
font_01_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 10416 bytes
SHA-256: 8f054548929bf351944bf6a8dd8d948443f736da1e94edc29a31af4daf55532c
font_02_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1