Malicious PDF — malware analysis report

Static analysis result for SHA-256 182eaee8d70a1757…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 16:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68a7819a6d8f7200da81a8a1b0154d2d SHA-1: b77d93f013dba6addf8376a4b1a14184d01e2df7 SHA-256: 182eaee8d70a1757a07971c8d9890768baafb23ce799e06f28ab23cbe1f9d798
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://reazfarah.com/ckfinder/userfiles/files/lojurojiwubababijut.pdf In PDF document text
    • http://goldendazzle.com/upload/quangtri/files/ribexagikevugofima.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210903095117.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/20712532883.pdfIn PDF document text
    • http://didula.com/img/file/21887113655.pdfIn PDF document text
    • http://atrsara.ir/resource/files/keripunarudaxinonuxiviliz.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///bekevotu.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/78490052051.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/jumelisevabex.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/wijifowaseva.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pomalopimewobafe.pdfIn PDF document text
    • http://badgerhillfarm.uk/77479269706.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/vipizebewurinax.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/gizilofemuvegip.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/94789073980.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/zaniwefimo.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/89729140617.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/96301612527.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a63e2440---55178787412.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/fikamips1q1sr285gloihjk193/rujiruxoluzaf.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/00a16594e0a21f7b98dee71509a1a9e8/33551533558.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/37462336539.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dapowanototixewenonopi.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/61653400395.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/3433301872.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b01ddb06f---29060913970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+first+mortal+kombatPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f1a7da73---ziwalexexanelajaxil.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_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 10572 bytes
SHA-256: c39eb71ff4ba3d9c71245d8abd8f22de0526654bebc430c39a17f4340b0de51a
font_01_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 17800 bytes
SHA-256: acc64fdaf43344296f46ec9bb60d1eb7ff6cdd4f97bcd66bb58c7d4d9f173634
font_02_sfnt_off0001390f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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