Malicious PDF — malware analysis report

Static analysis result for SHA-256 511720302b32b5af…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 01:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cce26df35e1aec04afd3f74a83d4689a SHA-1: ee72ab8c0f2e761f1cb58bb9f09f89fcca4e4456 SHA-256: 511720302b32b5afbb260846c80216fc3defaf179d6e984fd64d3250d16325c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the PDF structure indicate an attempt to lure victims to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://medvor.ru/uplcv?utm_term=kumkum+bhagya+zee+tv+watch+online PDF link annotation
    • http://dogomanhnghia.com/uploads/files/zewopegijibufibemaw.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021092303011371.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/87682640354.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/88969421417.pdfIn PDF document text
    • http://baove24h.org/upload/files/54079800562.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/sijisebusulobidafi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613043dc2238e---3539875065.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1632484264.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/webuwojuz.pdfIn PDF document text
    • http://jainfarms.com/uploads/15250570460.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db65e8daf---lonizosiwilolulafetibu.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/44508160727.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/12910382422.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/1966108324.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/jinowigilalavonenupev.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/58141676912.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/13019494476.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/18910784964.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630586124.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/fegeminigaxurudakixu.pdfIn PDF document text
    • https://agros.net/uploads/file/4878740442.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/xirelabanadesabajubiwon.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a1aabaac8ddd59be3c1643f16fd050fc/71195849799.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/zegemodovoliwizoziwawax.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_off0000b108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 11056 bytes
SHA-256: e529cb301a8789914d9cdebcfa67c4c26cdebe42b08a4d4a600f1fc3f1ffa9ef
font_01_sfnt_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 17200 bytes
SHA-256: 808a4f6bc78e88d8346bba9a8aefcc9fd8f5fdefcfd5ad441d689e3eed9c9cb4