Malicious PDF — malware analysis report

Static analysis result for SHA-256 935ef7e74927a307…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 13:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2211daf691d43b399ab8821fa64043f SHA-1: da5f5820dd14a74485d9c730331e90b88fda4536 SHA-256: 935ef7e74927a3078cb5755dd0e4e0f15a36963cb6505ddf27cfb68eca70518c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=tube+video+apk PDF link annotation
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/nb0i9n58phkvg6t7bnp5dda1ms/polofogo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57153162451.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jk6q3vmklrn4paddan3cncr9m2/30674278090.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/luzatora.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/19664185139.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d563d7ad10bcb6b205dadaf8e7d0165b/19763149481.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/sutoximefunadofuzujarude.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/51628695943.pdfIn PDF document text
    • https://davaocarrental.com/images/file/zirasufosazuvabelodos.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/22185691806.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/kigemese.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614064a0e5039---79336117770.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce93623b0---17891058664.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210909014545.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/gexema.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/28589214596.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/11492048750.pdfIn PDF document text
    • http://rhondachem.com/d/files/54393365320.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/78792862734.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/3775938223.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/3668940707.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/wozogipawizevejuwib.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/gekefenelezamekivilaxame.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_off0000bb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB07 17488 bytes
SHA-256: 3d2478226a302f4ae9f8aee455058c2d36e090dc6672db030d19b4b4d6c547a2
font_01_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 10228 bytes
SHA-256: 269225d932ebe3e2b44ba4e8855d56a466d4b3fa8ed24b97ce38d5c76e341dd8
font_02_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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