Malicious PDF — malware analysis report

Static analysis result for SHA-256 548bd3660d5044ee…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 15:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1cdaf8bbe35409769e76cd38c62475d SHA-1: b25278bbb9125604664a716a266c001fd1c56f34 SHA-256: 548bd3660d5044eee584ef074dbc93a690c1d69dcbc920b4b100be005513bfcd
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and a link farm hosted on disposable domains, which is a common technique for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted applications or further malware. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://alfatreyd-mebel.ru/archive/images/file/90802600096.pdf In PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/kabagizojefedag.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/62907533502.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/95213503855.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/1839770530.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/wulezakezuzugeloketivafed.pdfIn PDF document text
    • http://sissonne.hu/editor_up/43614671630.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/fifasawoselotoligiboluxas.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/56457599475.pdfIn PDF document text
    • http://topstec.com/d/files/33609344575.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/28871142115.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/80162492592.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613658dde6edb---23602295360.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cdb08050b---juxoxanexaxeb.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/polexifol.pdfIn PDF document text
    • http://salt17.com/userfiles/files/vefiz.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/42769385621.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a97fd7637---65040034862.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cjr3n42te59u8ela686cv1l8ct/46592735769.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/16210800111.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bcfaa963c---zenijevipituxuvewuzem.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/voxap.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/57635445843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=carrom+pool+app+download+apkPDF 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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 10272 bytes
SHA-256: b03a5cc5164688321a20cfa341d6f4a2a45b546f832082f971e6f84b5c15b1b3
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 18568 bytes
SHA-256: e670e83c7a26695363f54c62a62d37d5e3a4900747337bc5413af98ade643d9e
font_02_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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