Malicious PDF — malware analysis report

Static analysis result for SHA-256 51252123a5a61114…

MALICIOUS

PDF

74.8 KB Created: 2021-09-30 18:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99c1dbdef9292f246afb6773fcb05607 SHA-1: 290d240f54e70569d0026f39b77de79097167e1e SHA-256: 51252123a5a6111441f49751289a62ffd73ed07f605a10899f81f3cf146f2240
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating it functions as a link farm pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/20328905454.pdf
    • http://ptichile.cl/userfiles/file/watomegadodefifuzokoxe.pdf
    • https://djecijagarderoba.me/userfiles/file/68929029404.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615289f28faa6---3069516132.pdf
    • http://om-ar.com/userfiles/file/vozebidekabumevudu.pdf
    • http://yasaitogo.com/uploads/files/38275369316.pdf
    • http://orthopaede4you.de/userfiles/file/3943296977.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/kexupebazizafu.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc57241c80---rofomi.pdf
    • http://choragwica.pl/userfiles/file/jemirejipu.pdf
    • https://fiscconsulting.com/userfiles/file/90932372788.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/jepopunipipetewabatapaji.pdf
    • http://gostinica-domodedovo.ru/files/penawutiw.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e470b9ba9f---87343405293.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/25623792095.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/sabefizavusup.pdf
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/mafodidonajekufosavali.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614f018b8fcf9---35194794468.pdf
    • http://avsa.org/sites/default/files/images/files/97523050455.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/91324265050.pdf
    • http://hytechplus.com/userfiles/file/menefa.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/lewinunanekotedumari.pdf
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/18522458911.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/27393818315.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/kufedelagisa.pdf
    • https://webaruhaz.solar-napkollektor.hu/js/ckfinder/userfiles/files/vuvumajevafekigagil.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/bugijuvorixuweketoko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=assignment+of+copyright+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd43.bin
ad272df9982958b8e184bb951f0004811dac682c86a0b01305193254bf2d7151
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD43 18180 bytes
font_01_sfnt_off0000ec38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 16792 bytes
font_02_sfnt_off0001044f.bin
332753523ee1341b16187c2f6ab5506ea31e2b4ada57b7810d302b857ef97254
pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 10956 bytes