Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b9759b36ba10d1…

MALICIOUS

PDF

98.1 KB Created: 2021-08-05 02:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e404323592d29369e8b759de99e90103 SHA-1: a9a873583e028e8ad2164485a228b98a9a1317de SHA-256: 59b9759b36ba10d1ae8e64942a656d842d312f7b6bb06096872866031047c241
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links. The presence of JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=how+to+deposit+a+check+online+first+national+bank+texas PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2119f03a---kidavil.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825bf8c7a8d---giwuxedodokedodoziva.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794ccbea88f---sezaxukovofeweto.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/43039789994.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/dubixuj.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d950b406a---22117882876.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/juxolinazutuli.pdfIn PDF document text
    • http://klefmarken.se/upload/file/35327454692.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b57670222dc---69083350054.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d5dc0254---49025953773.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2r7rpcgiualp5b37f635lq413s/bamujuritikexi.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/jurodow.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/54909982452.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/sogujuf.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/34572048014.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/4361770981.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/giwaroberile.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/82551023647.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fbebc106a---30611082418.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608856e23d701---34467723330.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/89836844018.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/4115658775.pdfIn PDF document text
    • https://naoshima-habitant.com/25914491001.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a97b9a247---67483008089.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_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD3 11128 bytes
SHA-256: c35daa4f73c3a2f2dbb5d3977b1f24dde8524dd2ae514741269d903f6cdcf740
font_02_sfnt_off00014989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14989 17532 bytes
SHA-256: 0b00765686b674865bc5526ede00c4b8b8f98684c6621b5a1cff405a467cf615