Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9acd7974988a455…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 22:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8298c8f8634cb9ffc7c280702f3f6233 SHA-1: 3d267c71c381ea0560adf10eb60b06d0880451cd SHA-256: a9acd7974988a4550d6a60ecd8d815a5b829e99c3f0b0958f555020237aacd7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous links to external resources, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further malware, likely disguised as software or other desirable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab65ee942---35689154931.pdf In PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/bodajita.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3e8fd3fbc128d617a9e1b10ef7449341/jutujilokotojigirido.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/tabedofuwukiwewuxunerus.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/65485410754.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/76840456572.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/leleloja.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7315b061---3418970448.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/pexetubew.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/zixewa.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/nesefikerun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421b337c111---furumovas.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/96689107208.pdfIn PDF document text
    • http://www.77ice.com/upload/files/paradokakapukatilezuxajo.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/68533321269.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/29170081729.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/boremu.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021911043454113.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613028fa4b415---51921837460.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jidazitozigopenaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sports+live+tv+apk+download+2021PDF 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_off0000acae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACAE 11000 bytes
SHA-256: 86fc54423f4a6d52df042f05b61712c38a76c18da90bd82b6cba53438b626628
font_01_sfnt_off0000c66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66B 16768 bytes
SHA-256: b4ae8f71750e6f33ef896df57a5b97fdceac7738cbf03fe474aca53bc3f1438a
font_02_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1