Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79007d463928f30…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 01:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 271d5dc20eda62e9e54a4c744b35f847 SHA-1: 2c95e0f1f96958749a30449385ed9e32b31a30dd SHA-256: e79007d463928f305cab16e26862b6d7f7cd0e1a378c9e1507b32557a5cd5eab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised or disposable domains. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of using such sites for hosting or redirecting to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://krisoc.ru/uplcv?utm_term=php+ide+for+android PDF link annotation
    • http://grimastone.ru/files/bogatotudeweja.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/wilunapunemivopebezugodu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/39076897476.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/50935192456.pdfIn PDF document text
    • https://magerp.org/upload/files/70191007946.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/89659606710.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15b52190d---zesunukokobitojuwap.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/95549041585.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/76735113845.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/79198805502.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/23498136386.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142da1aec01c---detaveseneparimotoju.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/62672249701.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/3601882572.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/65476126071.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31026872547.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/puset.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/47388265405.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/14864145865.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/rebutazitibej.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/puvimuguvenebozezijo.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/40351591798.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9b1e3d888---jawarebegufososegago.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/66939283653.pdfIn PDF document text
    • 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_off0000aebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 10284 bytes
SHA-256: 136264cc3849e223a383a56791f050fb00c0e3e73d5cc009280b2e903a132eef
font_02_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 14972 bytes
SHA-256: 82c09b99667aaefd25eda6b6711c09eb5b309f0fb34c77a6a74c91458bad05c6

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