Malicious PDF — malware analysis report

Static analysis result for SHA-256 13be62e379d62c57…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 07:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 033124502adfd2b16f1343adcff51acf SHA-1: 17f2ca8766a8c8cf3a7efff022be58174d882863 SHA-256: 13be62e379d62c57408dfe4586d588dd71d62ed0e5af3a0b04dcf3c7754e42dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF_JS heuristic firing and the ML_NYX_PDF_MALICIOUS score strongly indicate malicious intent. The embedded URLs, many of which point to compromised WordPress sites or disposable hosting, further support this assessment, suggesting the PDF is part of a link farm designed to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ecodiagnost.com/ckfinder/userfiles/files/50920865379.pdf In PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/dusajekak.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/gejosavuxutebajotiluna.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/56967628518.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/62772439667.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/fonama.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/23376993309.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/mirupogunenulibebal.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ui1t1bq3cjopmmqcek1hu3ho7n/93176305453.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a3d70aa0---23897659731.pdfIn PDF document text
    • https://vleek.com/uploads/files/14964288735.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/tifonijejikej.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/lonotunizolejosoruba.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/96034476649.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/sord47mb037rflbk3bjffg0m7t/bametekej.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/rozekarudopi.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/68881354085.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/dojifasa.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/80321844229.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/kibepijikijitol.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/63577133105.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/46921781336.pdfIn PDF document text
    • https://rjpexport.com/files/votiwejujefuf.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/gajulekupowukajif.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/20865657216.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/15537124148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=offroad+drive+desert+download+apkPDF 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_off0000bd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 10760 bytes
SHA-256: 8308cc0d7a4f47288f9d22a56a8c1ac97d4756e9e2ce51cabe776f1449d7a0ae
font_02_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16624 bytes
SHA-256: 12025a50ea875a012f28f48aef022d8ad6c36a4c661c02bbf8f228091b452f14

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