Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c52dd63f2dbb072…

MALICIOUS

PDF

87.7 KB Created: 2021-07-07 22:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01901aac102cf00bf3dda076538cdfa1 SHA-1: e6db457780bb0f9533c31570bcaaa3491341e1e9 SHA-256: 4c52dd63f2dbb07220125aefcb0569168549620eb941e242e84c5587c9e42b96
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The file's structure and content align with a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/mujexiv.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090154e6039d---balekebuderefotoz.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8969a95c0759105d5bb92e5501e70fe7/60310068639.pdf
    • http://volkshilfe-vlbg.at/images/content/files/waxulo.pdf
    • https://skinrepublic.vn/webroot/img/files/fipatesugitaguk.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3dn578g683lrohjrpefhgf0lq0/74377957772.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5b0ba4b4cba6ae811ab914d53c35ee2d/64523079969.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210708022919.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd2983414f---serabekaxejozubanamu.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hsi6gec3o1881brg7gmfrki9fv/83120863034.pdf
    • http://modellszerviz.hu/userfiles/file/pujololokazej.pdf
    • https://alianzatours.com/imagenes/file/lipasufizixiwujovi.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b96512120---senobez.pdf
    • http://madmojo.com/fckupload/file/11206435369.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9ecgeie36pumgj3nc0sv3gqj80/41861209668.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b67cb443---91655856812.pdf
    • https://sedefartphotography.com/resimler/files/43534911989.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6547dfc80d953a36b3f6bae9e20bcc20/lilarirurelututekuvasawam.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/21974933633.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f57c2f1fe---33916865086.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dbc6fc9fea246d43198dacaa26dfe363/56302188109.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e1a65a28---90258985993.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080289278bf0---87124175610.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lesson+plan+verb+to+be
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f3.bin
52dc808d694cdee61ddd25bd49e68151e5874918639f68773dca263fd409429e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 10316 bytes
font_01_sfnt_off00010c2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 16792 bytes
font_02_sfnt_off0001243e.bin
c84942e5e2ea1fc16c9c712e7c730ba0bc334e8dc8c2f2166ae748a8d24d65eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 17276 bytes