Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedeb7315b3f3b5d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 18:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e28fd7db9e47f65715462f7527c41a5f SHA-1: 49ff2bb1309e7c93583200f5448ef7931f5b0868 SHA-256: aedeb7315b3f3b5dd1435e3afa1ce40bd32ffad54e0d99eedb3672c25395f770
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/zujiz.pdf In PDF document text
    • http://benevolo.it/userfiles/files/49812355320.pdfIn PDF document text
    • https://ferropula.hr/files/46389340534.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/60130316422.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/99590407e8c38c9989967b95a631d88a/gedolega.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/5464457210.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/77476183081.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/89887607951.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/53281098384.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/60261584709.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/tajixonilulafepe.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/42899413917.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/25740244837.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/12985028372.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/54384407067.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/varejosok.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/zogososexapebovazexiki.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b7af4fda3fba5fcbf95f8de8c866b0c2/dujapozifuzeguxemexawu.pdfIn PDF document text
    • https://basisangka.com/contents/files/xuvujimi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vowojodejilalazorunebeko.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/todixitokasojatina.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/99137640217.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e736500c4---kabekewedakitanuzo.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/dojavazevunatofazakojowi.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/94101528928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mod+apk+idbs+bus+simulatorPDF 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_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 10644 bytes
SHA-256: 70c73b3427a2a2397d15855e6326e461655f01f33207e3ae1088ef5eed3bb75d
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 17076 bytes
SHA-256: d8d98bd7cb21e8333bcdc877f8551307b0c63b0c4f9913d64e8047a62101afd1
font_02_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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