Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68a119f93c77dda…

MALICIOUS

PDF

74.4 KB Created: 2021-08-12 22:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b05f9f954995d7851af658e6d10cc97a SHA-1: 0bf592c3ed9f461c23d13d2df33feab4021887ea SHA-256: b68a119f93c77dda922719cd0186e05531bf48d2a9aac70c49f2a24f7a3d991f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://lightofislamonair.org/uploads/files/40182209859.pdf In PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/jifazipexilulipewegukorov.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/964c3ebeecfd8d315d8b243729761cb7/vupuwagewedesasivalejo.pdfIn PDF document text
    • http://envigest.cz/upload/file/54464225520.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/47419743301.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608007f38c2df---1961505553.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/9fc7de7d77e5f825dd003e3e2aa5f097/48383717675.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/zirewe.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fiponimavuv.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/mazube.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/972b8b90b31c4cca43487e1a257c5a44/tugusurejil.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/2734156876.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5068c2e04b050a8b3d95a2d9b84cf78f/8532494461.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210704205005_tsk2ud.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/kunole.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/84204842195.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/kupis.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/vomisurixosiren.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c97a142d---96867159130.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e60fe41d152---vibofijexerano.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l09obd3j4q1saf81tkkea7hvf1/31483690866.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/dca98d2c158119707ec0ff5e4a60464c/74552214851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+open+a+sentry+gun+safe+without+the+combination+or+keyPDF 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_off0000c04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 11404 bytes
SHA-256: 148c5ad91e1d0c41bc7439bb316c6a3e23a795bee2aabcc87d8cfcb1645ab7d0
font_02_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 15800 bytes
SHA-256: 5b65e92af3731cf1d36872d99aa85de81be024336451c4f1506213e3b96c459f