Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb755b97ebf9c67…

MALICIOUS

PDF

87.9 KB Created: 2021-08-21 15:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 259053b33ce1b49bd0061c99c16b0bab SHA-1: 53140931355253252735369e473f30ccde112e63 SHA-256: ceb755b97ebf9c67116099102f9f99b9521cb753d558cdf6a0c1babb3e8ef0c1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate effort to create a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://beautyyaurient.com/editor_upload/file/bamizunexiboz.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/335aa796818d21a527ab267c8bad98d3/fupimegele.pdfIn PDF document text
    • http://adveotec.com/img/file/50447090857.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/68599057916.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff74854034---1632049116.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/65604307321.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/d76e2e3558174a9d6f2e8521fcb87668/remapokajineko.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/90138607503.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/75614284514.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ad9dad030---fedabupisozofenerub.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/60619242117.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98c043927---xanejetetuguzaminadafave.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b528a2a086d41887c880f55805827ff2/birarul.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/dezotukevogimesujawovafor.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/35494955403.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/sigobizufelerarajowu.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/84321257865.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/11733012557.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/samawulubixojefedazadibip.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5118c982d91a4194ab6d0bc1559e499c/24579670607.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/67991174041.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/jeguzojowiwuliponikuzamu.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/vupusajaxoxat.pdfIn PDF document text
    • http://kalikraft.com/images/file/burofivudutedavaga.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/37062a6ecf4c50714eaa0f3b1486d729/suzezejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+reload+swiffer+wet+jetPDF 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_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 17532 bytes
SHA-256: a223d2c8f7bb6b5b480c1fdafc4f494c2112639ce2fe31cf2e3696c8b1b1e11c
font_01_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 10448 bytes
SHA-256: 7f7fac9945a6ea833b805bb3025e2a4f140416a5e3ea2e6150341512cc31cf6b
font_02_sfnt_off000139e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1