Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bef05de4fe36bd1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 17:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 228d4f0128c8fefebd143b8c34f5a679 SHA-1: 5ef518d70df9f5085bd79298d656b0b57c099296 SHA-256: 5bef05de4fe36bd18418d22f224457be805d7b6a44756956c914a578ed31c5df
172 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are part of a link farm. This suggests the document's primary purpose is to redirect users to malicious content, likely a phishing page or further malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://chamdure.com/DATA/files/50801240255.pdf In PDF document text
    • https://dongcohonda.com/userfiles/file/suzixalivunegiwilenojazix.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/tefasimati.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/62559434206.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/rarilewojikowakigisebanon.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385cd81e92e---zurite.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/bapakakomakidix.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/tabudamuxomelupekiroru.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/mepijuvuvijulefetuwitubo.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909150022.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/nidokavejararo.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/79493096617.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a988262e24c8d0e9f0d6048c0a2902ce/23983822208.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/61501583129.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/tezeroropuz.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d231a8d15---9953302529.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/vipireradunamijurokox.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/42135955981.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/milorujuban.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1043148fc69953d549362ab28f7fc5e7/wawalalagijo.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0811951001631207890.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/rasezoluzurogupelubog.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/67d0597a5ff68c5c141ab39f3684f558/31520867469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+spider+man+online+freePDF 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_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 10880 bytes
SHA-256: ae94060f32ab3e8de417ef912801809bbcf20fca596fdfe59eb1e3c1008e39a7
font_01_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 17620 bytes
SHA-256: c4fccfa1fe7d20c2bd569f810249935615375815cf3befba3783a8b796dc272d

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