Malicious PDF — malware analysis report

Static analysis result for SHA-256 08358bf4764b3efe…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 07:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b58150be11ecb2d8a7732f8b7f3bdff7 SHA-1: 3d4fff51743497889e6893863e004b4840358cca SHA-256: 08358bf4764b3efea980106bbaa91a9eb42d8e706a2f9732c6867fe329c3df62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm and was identified as malicious by a ClamAV signature and an ML classifier. The embedded URLs, particularly those hosted on compromised CMS uploads or disposable domains, suggest an attempt to lure users to external sites. No scripts were extracted, but the nature of the link farm indicates a likely phishing or malware distribution attempt.

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 https://eltonltd.ru/sites/default/files/uploads/difoxubijuzedizigufudar.pdf In PDF document text
    • http://indagosrl.it/userfiles/files/91062082092.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/67782057567.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/acenka44cpg673b98vu4p0v4gc/rixiki.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/gobane.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142f6cb140b6---56125406595.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/gemipumajevanefivuwo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/tojokema.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lgmhuicaul91dem17922trgk7f/20791909528.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/zabokevegazedi.pdfIn PDF document text
    • https://istanajp.com/contents/files/80476140228.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/66596744188.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351278522bb---davakanoparud.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/satiduxawami.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/85292679543.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0120ebc70dfb4f2e4e59bf51f8b022c8/36941798456.pdfIn PDF document text
    • https://atavio.ru/files/file/watamozi.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/fejakavupun.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/19408353872.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/70626889940.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/tujigelew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=exit+path+2+unblockedPDF 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_off0000b90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 10880 bytes
SHA-256: 16a41dc92cb442c1434037b16e5b4470f3993cb46154d4857d96754ef4eb302c
font_02_sfnt_off0000ea0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 16196 bytes
SHA-256: 8d908882cddc9cadf273d8fc7bb9e20d3927f9932edb11716822b1ce8e366853