Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c021ea20a8585cb…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 07:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1682db4d93ce8f4ce086f0fe2c969b4 SHA-1: 6b0de5751b3c1439ab021ba417319fdc007eab0f SHA-256: 9c021ea20a8585cbcf4255d0c1710dcfe9ccbd847aef5436f394856881439643
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, including one pointing to a compromised WordPress upload directory, suggesting an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=dragon+ball+z+season+4+episode+list PDF link annotation
    • https://subarini.ro/mm/file/nilexizaxepasonajifalaw.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/zenodebilerufirigaporozu.pdfIn PDF document text
    • http://labradory.pl/file/xivawulimivaf.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/42954415565.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/latutuvepabil.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/58822125096.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/lajuwazuzag.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a851bec28---14693122043.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/lagudedovetiweja.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/26532014024.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/30557307545.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m2gbvab13ubgjeq37e78jrjq35/50396175222.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7625eb2f---63608354340.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/xafipowumobarofobarativag.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/zubekazazogobu.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/xezodavibig.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/88356616057.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/55586093690.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/ladifu.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/71908920137.pdfIn PDF document text
    • https://fobh.net/userfiles/files/lovukukib.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/89570426904.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/ganokade.pdfIn PDF document text
    • https://badoza.net/userfiles/file/xupavaferifazazelalikumij.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_off0000b54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54C 10848 bytes
SHA-256: 279ac7e8bbfe774e1392efea44fd8b178d4a1fa6e3ee381587db0eb56fe63c34
font_01_sfnt_off0000ce0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0E 18252 bytes
SHA-256: 5d7d1986699b0223e07c9d9f9dc52dd8adfe48c0aafdc66d19a0f8f73fa9d552
font_02_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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