Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd450a9b14a0cfea…

MALICIOUS

PDF

70.6 KB Created: 2021-09-21 02:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 123af7dcf42e7fe1a4729a83e0c09fe9 SHA-1: dd2a350116068c89101a2a34b869aa820ebf110f SHA-256: cd450a9b14a0cfea26dc768aa81fd762539500a270aeef7b21cf4b2deac3363a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=kimetsu+no+yaiba+anime+movie', are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=kimetsu+no+yaiba+anime+movie PDF link annotation
    • http://chaukitchen.com/uploads/files/kaset.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/dojowedokuxiwe.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ede42d8b2---tewukawifedoxipor.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/879981861.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a0a31ef5f38b1998ca64a788d9285c42/28433118297.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210908_142035.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/pipezetizanila.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fikubapofawar.pdfIn PDF document text
    • https://ptogel1.com/contents/files/57162649604.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/pazosemobutulex.pdfIn PDF document text
    • http://njchemland.com/upload/files/64051846407.pdfIn PDF document text
    • http://fygl.net/uploads/file/0603100045.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/riterubelidatipolepuf.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109091824064915.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/bugukozukinudige.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/90965103449.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/kesetoxafanezejav.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb59ce15d7---74765200644.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135cad889160---vizaranif.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/gijujevexigutejasi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c02604891---82333917483.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/papebenudorixabodivaj.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/81ajdorm4qvk0btnq69a7j12f7/badovovesaxujotosemesekor.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/werox.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_off0000b557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB557 10532 bytes
SHA-256: 4da0123d321ff8cfeee47c935286760578be9936bab28717210f5143541028d3
font_01_sfnt_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 15668 bytes
SHA-256: aad392f6c74f97415e63061aa77325e041dc4c182b83925fb3b1918a9b61e694
font_02_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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