Malicious PDF — malware analysis report

Static analysis result for SHA-256 121c6acc5e0a3b29…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 04:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80b0f9a14e0964644c75264315b91f5e SHA-1: 8ece6428a8a71496626a9f24f108ecadfdf70d2a SHA-256: 121c6acc5e0a3b29676178b5a38992f08e8a406d6b1f4075a4821867dfc7b5cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to potentially compromised websites and disposable hosting, suggesting it is part of a link farm designed to distribute malware or lead to phishing sites. The presence of a 'download' button lure further supports a deceptive attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drivingschool-brno.eu/files/47393238351.pdf In PDF document text
    • http://akcihlar.cz/userfiles/file/56637813869.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/67tev6n53q2ud6u5g6fqe8kn7s/nozexaxut.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1f754aa7---pogesipeguvimesekodi.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/80842095749.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/18672121386.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gagevesajodizogabamis.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c71dabe7ab---74770107113.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/xubisaxel.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a955869f001---39629135101.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/piluxujeto.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kawetutofefudu.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/12760069382.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae48b9fe73---14751925875.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/52158859610.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160940d114e007---wamutegujof.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160712705b9951---68876431010.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tsdmjon893ut7m0odo5l70u5h6/74845661932.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/19718642516.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/gavutivinazorugigatatu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/41b0f05e1e600c019ef5c2d34a6e3dd8/ruvozaxoves.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/javukasazanadedinenax.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/76654551266.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6122b9bdaa---63837248226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=school+management+system+project+in+vb+pdf+downloadPDF 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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 11680 bytes
SHA-256: 9b1686107a1280186796d74a3dff17adec53f0ba1f016cd3b3ed99bf62cb91a4
font_01_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 19316 bytes
SHA-256: 7842efcf9aef7f487c6a87dae5abad61bbd58e4e96c2a3043676459e9031fbaa