Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed40f7ad859f261…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 18:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14d651635dfac0923696b149afb070b0 SHA-1: 8a98ad0a6cb4b282b7f8fce187700d86dff35103 SHA-256: 3ed40f7ad859f261f87527db4ea8d5ffdab572753592b523f360b09cbb896035
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://zemiigori.com/uploads/file/vifidubugupanifezezabino.pdf
    • https://joinvita.com/neu/userfiles/file/92233170509.pdf
    • http://maxidmum.com/images/upload/fck/file/8566640179.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614799af9bcb4---xuligelalemafomisino.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e963fb14186af0a37e01a860187c1a05/3258497897.pdf
    • http://barcelonasixtytwo.com/userfiles/file/nalumug.pdf
    • http://teleinwestor.pl/userfiles/file/66847717022.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/50848503163.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/61577458797.pdf
    • http://araratmebel.ru/img/file/kuridadupuxep.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/ripulelob.pdf
    • https://lacgl.org/upload/editor/file/56275026256.pdf
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/xagotaxokebix.pdf
    • http://baracenter.be/userfiles/file/gosoluxebujawo.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/bapisoka.pdf
    • https://yoimart.com/upload/file/20210923145437.pdf
    • https://sbsoftware.ro/admin/userfiles/file/21400330968.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/lenejesewunodinoginimido.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e42db737---dosoxabosilonipopow.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/56202142210.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/271109089958.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615676988b2c4---78579138159.pdf
    • http://rowerowaszkola.pl/imgturysta/files/pediboxavobuwogifo.pdf
    • http://meta-min.com/files/gufelofigamowodegix.pdf
    • http://challendor.com/fckeditor/upload/file/3473823893.pdf
    • http://www.aragonemprendedor.com/userfiles/files/45933877347.pdf
    • http://tpdw.pl/userfiles/file/8841565793.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=carol+of+the+bells+piano+notes+letters
    • 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_off0000b2d8.bin
a35404b317fd1d9cd080b1ee82ab661dacf138c23ebb80d72ccd694ca1ebac09
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D8 14424 bytes
font_01_sfnt_off0000d6c5.bin
966ea690babd7748517bc02e94370f9d988cde34a256671362579d84f2b81cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 10628 bytes
font_02_sfnt_off0000eecd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 16792 bytes