Malicious PDF — malware analysis report

Static analysis result for SHA-256 243931d366de325d…

MALICIOUS

PDF

80.1 KB Created: 2021-07-23 22:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d9bc5aa1b2eed85698df45c372122f2 SHA-1: 56e170968b3937499354e963f02edb33f938643f SHA-256: 243931d366de325d4407a12364615494e5c0256dcb86e6b6181e4bd201c5fab8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, specifically within the 'uploads' or 'file-upload' directories of plugins like 'super-forms' and 'formcraft'. This behavior is indicative of a link farm or a phishing lure, designed to direct users to potentially malicious content hosted on these compromised domains. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4828061ef9077ea735104a10b2fed2ae/54979058205.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc78222025---92482861603.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/rawadep.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d6ebd4755ffefdcf2c1e8ded19e747b6/murujorobipogu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a906d24b4ba---pogovekigo.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/18943941249.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/939239ee9fbb3be0a8dc16c2a7caa1a4/sitofemetemexasijov.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/36865294500.pdfIn PDF document text
    • http://tfforming.ru/d/files/gukudunufonisutowubomep.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/mizevinokizunu.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/23589097068.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/73kg7krtmp4v8i8c3asc2csk34/83964719850.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/wupatapevizow.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/12578708050.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/xitugilagakazuzupuwig.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bb0c5ig3kq7aqq1fi5mrtet29c/71646147460.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/be0e1ca3c0a49d4079c6d39131ada114/65997559650.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042911434473499.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/87128957111.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a77db0b49a1f07fd479d6bfe964d88ce/81269721666.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/lafuberikawanalulawetik.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/10084902915.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/tjck8icvcc282fgqiovuu1ajjp/51222871791.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vukn6lv25rkc44oqomb3i70171/bitenamevasewaxa.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d94813b0585f600b813920ba624e1073/36229305954.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/36899578033.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rqjoaidqbn3jera5fp1r2qi7q6/50700846095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=comment+dire+ater+en+anglais+tu+as+quel+%C3%A2gePDF 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_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 11056 bytes
SHA-256: 207218e91c495d49e9b923b614b2c2dc6ca7b0868b66244c4e0ad37d440d957d
font_01_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 19184 bytes
SHA-256: 130d8ecbd60196b95231e6a876f86f8b24c5d9e2e907dfb4c13783d146da89a8