Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9a3553f4067b95…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 00:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe5a8052c5c4809160ec6b94047ed34f SHA-1: 20fbcf37b1cfe1e1d2acc1bf97928f920705b08b SHA-256: dc9a3553f4067b951debbeca838f3b151fce0c61d3c27bf40760e53f60392c2f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to other PDF files hosted on various domains. Several heuristics indicate this is a link farm on disposable hosting, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://neoneofitou.com/ckfinder/userfiles/files/nuvujut.pdf In PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/7740959254.pdfIn PDF document text
    • https://kawanmto.info/contents//files/36799981041.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e7e7ca05---82994310797.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5iq3dvkgqr7qrff47to0ss6lrk/vegusakoteduzetitaw.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/46807518633.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/goruz.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090904bc5726---732625228.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/lidekexafu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c14b28a9b11e57ba732b6cbd024b40ea/befowadipipuwe.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/turutirumubodu.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f667b3c16---porelefakusamupo.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/25801206215.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d61aa09864---14606899875.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/kupabubapilu.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/sosaxikizi.pdfIn PDF document text
    • http://riph.pl/userfiles/file/91971563659.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kabagujitabolat.pdfIn PDF document text
    • https://cubic.is/userfiles/file/50222405109.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/17580b023ded916150b4207e71ae10de/naxutidunusokasunufujud.pdfIn PDF document text
    • https://12shio2.com/contents/files/pujudarozal.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/vuzawowopar.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/jizogada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=puppeteer+xpath+selectorPDF 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_off0000c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 16332 bytes
SHA-256: c50ef062018d35251b099bde71765a217ea6e51190454851d67f09915a5a021e
font_02_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 10476 bytes
SHA-256: 7903c8fc421556654f3eab2b88c427a265319820676e71cff64e11884f794e90

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