Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb7119d35c1cb6a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 00:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7518337ee5d41549e427049aecad518a SHA-1: c719998d6c80a21d4fcbe884489af7f46b766cb0 SHA-256: 2fb7119d35c1cb6af749ee21188b0d6bddbfdf8664acc529186a80b477f507be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, suggesting an attempt to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://podiummoda.ru/userfiles/file/gegaserimupodokujufas.pdf In PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135603d2c517---15102695187.pdfIn PDF document text
    • http://anm-av.de/uploads/files/viwaluleserinifiwux.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/63267198306.pdfIn PDF document text
    • http://come2menorca.com/images/file/zakipubi.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/mofev.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3ac5d6b84bcd4d3f20296bfd9e18c3fa/50009140597.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/70878643530.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3859a11d81a4eb5836551f9cc53169b1/76548358804.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133abfa55d68---50225533650.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/nukagug.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/bilapifisugegelaj.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/80673417742.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/99326934634.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/nodoferewugibune.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/53447357353.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/63314161047.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/bemadorot.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/bafuroduzogasufo.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/soboruxabibotetorojimusoz.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/38119592709.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/42713199552.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/872f50655252c7395d6b44b9a65debf5/tifobamobiga.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/47552068621.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/xowopixuj.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/74651772381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=drivedroid+windows+7PDF 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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10136 bytes
SHA-256: 0d8ffe1eeddee518a949a9c15641befe2678f59ed097c3532cb9e33bd7f216c2
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 17304 bytes
SHA-256: 7e52864ccf816ab4e8819abe45139431e2d85447d6a6b5423fa4dfbf20c83292
font_02_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1