Malicious PDF — malware analysis report

Static analysis result for SHA-256 895e3c229082a17a…

MALICIOUS

PDF

75.6 KB Created: 2021-08-05 13:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad3748829da3fead05cc0ca57430f039 SHA-1: 9879fd7713c08dc492deb997c8684c0c9b38656d SHA-256: 895e3c229082a17afdf190e5a81bc005ce348923e1158e0ff40fea58aecccfef
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or malware distribution points. The presence of numerous external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://alfavs.eu/userfiles/file/lewinonupexududu.pdf In PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/6almetabh3ef3bcn3dj6pkdjed/suvisukenolazenotu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/10980340964.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab546748952---faxadilixuluzawodobig.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/aa602svj2216cjtjr7dsio7kpv/74950381410.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210525130622.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/22615926970.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/bumuravevikijofit.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/m65ar3c2lanjka4phd10sg6gh5/63651254485.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/5025110239.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0029b98b---retuxakemewawamirevuwe.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/hoo9j5f0u7oaq555039tskjbkt/92049888682.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/84279311001.pdfIn PDF document text
    • http://midel.me/userfiles/file/zivaregowi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e5567f2---90097056174.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9904a53440edcef9ec1237d87e59b5a3/94199538783.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/zuzit.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/olqh3lba5n0jbfsvfmurjr2dqs/joredeb.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/5ickgp78tv9lsn9f50s4r33j36/xupikonu.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/piwifujaga.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/12724242137.pdfIn PDF document text
    • http://blueyee.com/upload/file/17165813180.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/xivapuraza.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/sogil.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/93134642584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+flowers+of+war+2011+english+subtitlesPDF 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_off0000c37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 11076 bytes
SHA-256: 2702d26ce5b9761c1633db9b1a93794dad1c373b0e9445cfa01a21a9a66e5145
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 16248 bytes
SHA-256: 3a24e026f761f0445dedaa66cde2e78cdc110e69becd4e4c4a7130bc2ff2ad9b