Malicious PDF — malware analysis report

Static analysis result for SHA-256 4558dcfb4f83d6f4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 02:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e33b9da6dd2645c772a35b3ee203ce9d SHA-1: 5d65584a463b935c6c8dcf534dfb6b6290c6e89a SHA-256: 4558dcfb4f83d6f4ca7d89bd7a8f145f0fb3cf75ffc94e2a1a6fb6474528f95c
162 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 or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely to phishing sites or to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9244

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.
  • 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
  • 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://huijingweb.com/upload_fck/file/2021-8-25/20210825221703138297.pdf In PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/97842881846.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n29sgnv0fuvl6o87lig1pmoe14/wuvik.pdfIn PDF document text
    • http://amdind.com/userfiles/file/70300993162.pdfIn PDF document text
    • http://idcla.net/upload/files/defofesujulaxebo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63553424c1---bejeponogisaje.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/79247592575.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/16608677475.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254694ad2d---govonalelenopes.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f9cbec1ce6e24ed5e546f8c584c49ec4/9021650123.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/xunukasawijesatu.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/30254147264.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/s2da85ag2n7ir8s324li0g2htp/20466710271.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892368601a5---49823781696.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210728040547.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/93235579099.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/65090463496.pdfIn PDF document text
    • http://xsjprinter.com/d/files/giwurexajajedezapajo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa8d4f7a9---64976561251.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2900e0e2c---lewaranunuriwos.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2c8e24mtkn097l155u9ecj14j6/zugirosowefewubixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+song+of+lawinoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 10344 bytes
SHA-256: 60f423e242a4b34990967ca3f403359718ca56d00bbe94e873ce68477809b526

Open this report in the interactive analyzer, or submit your own file for analysis.