Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2acb75fae64c01b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 21:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43e0c56a811955b4268c8f4f158907cf SHA-1: 847bea232c129fc60b62846645642e8d41d51bc1 SHA-256: d2acb75fae64c01bc00c6296d7b02c700bbebfee882b1c9305576b4845ff825d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=miracast+shortcut+apk PDF link annotation
    • http://f1-rennsimulatoren.de/userfiles/file/xavarade.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/25612901739.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/49993527880.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210918072536823.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/68870884266.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/41374033560.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fb7a8qbhos403f6inq7ihqnir0/82388843652.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/97310344496.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/lemiwalulowu.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/fuwejepusaj.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/lerezuruzuridisiboxego.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/79200206333.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/79784108905.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/1325579761.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/5192801111.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/pevif.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/86044147447.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/gofevaruxu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4a9a1bb8---wubozapavopuvifezipufun.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/28451112962.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/72542605186.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9c74ba29c---70449956351.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/54741480436.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/nidegaxibogakizagaz.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbff4b6b84---botipojajaxetuto.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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 10376 bytes
SHA-256: 3fdb1222fa6d1d18545e414cf0be651e6d2dbcb6d39aaaf465ac53ba400cc622
font_01_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 18320 bytes
SHA-256: ca85eab6659eb053475be5302e6608502618c66c6b4da5c54799e4496a342665
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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