Malicious PDF — malware analysis report

Static analysis result for SHA-256 493ed3639a545e14…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 16:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46f950e61010c2c9dd5f228e132266f7 SHA-1: 6c6c551ad9c7cb8af02ab04b6f1a92fc88a02577 SHA-256: 493ed3639a545e14167eb8ce6c1ef47ec9776b10921d39706a1fccfcc02aee9a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms for SEO manipulation or to obscure malicious destinations. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for exploitation in PDFs. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8785

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://konferencii.org/js/ckfinder/userfiles/files/borazuwafoxer.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161313aebeff9c---10717263503.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///gegeviviretexodosinibe.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sitikogalotadarawofijuji.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/6012813136.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/fadewaput.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/pufunakofazititopew.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/58598450483.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/19953869632.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210901_63183E3DF0E56B41.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/74870286439.pdfIn PDF document text
    • http://jljemc.com/upload/files/topodosazop.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/50610579939642d0e2801f2b2f8ca980/nixomugopili.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nofelexezedigekukopip.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/39092373155.pdfIn PDF document text
    • http://grimastone.ru/files/57007558589.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613da2863f3d8.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/luvomer.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/wadofizaz.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/39185046026.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1d7ei420n5jtjo3cr8pccdsn85/pinesukijizujejejafix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+scan+a+barcode+on+android+phonePDF 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_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 10780 bytes
SHA-256: 68293fd80b4c1010a0161879a0bc351724b2b8a6022c2dc01ff08fb441a35ca4
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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