Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4aeb41cce77167…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 03:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4dad4243fc58ca7c0674adf7001a4c0 SHA-1: 4ddda7db9b155eb0a661b2d5ab7c4105a34287ca SHA-256: 1b4aeb41cce771677a2c2bde8fb0383ae33b38a11d2afafe3057d4157acaa6ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://i-dron.cz/data/file/soregu.pdf In PDF document text
    • http://aktifbant.com/resimler/files/95290286299.pdfIn PDF document text
    • http://www.pvvc.cz/files/90436215265.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9024ab616---76022927949.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/37349917560.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/busagugadavariwezi.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/ribuvitax.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/lexafatokedejobutizogojol.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/pavibovur.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/kubukatu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/pekixo.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/regosudokurokitemova.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145096df2bfa---ladadu.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210901125437.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/64561017557.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/pulukidal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355fe62ae82---zafowa.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ua4leirq4oa5a48qkk2fs4n7ta/kimanalikigunifapuvotex.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2a3k6olts0hvanpoks6ik27677/80285933774.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430be72880b---lozakepabow.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/21208903297.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/vonapaluluwidir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=places+that+fix+android+phonesPDF 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_off0000af41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF41 16032 bytes
SHA-256: b5105935d7e19ebfd6a6cf491eaf2af91cfd28ee379bfc85f6d4d8159c10e8fa
font_01_sfnt_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 10820 bytes
SHA-256: b3b96c6b23b1f3ea3e3c0c7944d6909fa2e68f8949bdfbb60c77a4eda2b813e2