Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13a255b26157a24…

MALICIOUS

PDF

84.0 KB Created: 2021-09-24 04:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 967a84783bb24c67c1f09e3b10b96224 SHA-1: 82d184ef23cb60d619b08bb25f82904140717791 SHA-256: f13a255b26157a24a32a2c28be886ddeab727fc0532bc72c302d89a4e245b3de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malware. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://opersan.com/file/bezara.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/qjauuluulf0ng7nuqt8ff5uqa4/19914530020.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///91690679528.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b2215fce---zoworuzofubedetuwig.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/doxejinazuw.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/28703547185.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8e65da52---72825153545.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/56440471243.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/16186676788.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca7934fc74---zigixufefivesijego.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/sijovuxumezaxotug.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/166f25e89a99d828dc91d6b903af995c/dafedadivafasug.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/duvukekamidemilofeziselox.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/ragefowarus.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/rokufadu.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/39613452460.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/90714087691.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/56404817775.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/47590553382.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/xilopizifa.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/98449020820.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/geburo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gowawoluwexijixifin.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/migazimuxajuwe.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/45368980123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=conjuring+1+full+movie+download+in+tamilPDF 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_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 10996 bytes
SHA-256: 3e0848c53d616290e8157a436c64bbe09081a590ffcf611584c9dc343deadef4
font_01_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 17692 bytes
SHA-256: d6aef150150a4a42601a4a2639508c0bc98578edd7db8cfec7aad6f76002ee3c