Malicious PDF — malware analysis report

Static analysis result for SHA-256 727fe663c56019bc…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 09:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45478960a1167aa0d641744bfa34dae4 SHA-1: 3b001f52f0a7f9a8901c590c125c61735da56849 SHA-256: 727fe663c56019bcffe4723a3c4977f27535bba971da95fa19530d9b6ecc522a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malicious download lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous URLs pointing to potentially compromised or disposable hosting services reinforces the attack pattern of directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://schule.havonix.com/ckfinder/userfiles/files/45442826828.pdf In PDF document text
    • https://booknowrentalimo.ch/userfiles/files/jomadoxebumavek.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/vatupukokikokej.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210909015952.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613318a68f322---fijiweg.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/sazojawifuporuwimug.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/4906973301.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/vasunarureb.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/91626784058.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e72722eb0d---narifalulijolupewufeke.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/52287657511.pdfIn PDF document text
    • http://12shio5.com/contents/files/geziragutejabeto.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/sorelasa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146465bac865---vapuxuveluzajol.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/58672171494.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/79582227273.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/84008635081.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/zoruxaxonilowifofa.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210907_051542.pdfIn PDF document text
    • http://esangsok.com/upfile/files/21734993302.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/junikixixo.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/79058667343.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/65550098759.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/gezakexixemomaxuwifej.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487727d73da---40459757233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+rush+rally+2+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_off0000b5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D1 10680 bytes
SHA-256: 77c729145f6732dc423b413ead45d90e39789e271081da1992275d1b857d2c29
font_01_sfnt_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 16132 bytes
SHA-256: 3c9b3b68d98411d5b255577e7e4e4136043c2fa8092531f71082553fdff7e880
font_02_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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