Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7458c2ce9859926…

MALICIOUS

PDF

89.8 KB Created: 2021-08-05 01:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 98a05ce7028c98cdefba93bb6e438bfc SHA-1: 98884fd498de43f8f08822c64a9d6b93471f9a43 SHA-256: e7458c2ce9859926d22b9e70e07d17b416a1bf07aebced407db44d7e0a1ba902
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://kaies.cn/upfiles/file/tetixemukoziba.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f52d4f6a8---varexatisexa.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/6252158709.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c371404ac532a398e7de90992c3cad61/japikumupemala.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/wuviwegulag.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bee058d9b---sazoviwepotaxevokuledivop.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/24ecca1c82caab8bbfdb9a3098af95be/vuzavawesetesa.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4f5daa4de97d8fb694781a8382d9c01e/78656064059.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4789025982d4839e255955e82e2b14e0/tawezelefenodilivesive.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357cd19d56---36704364171.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f4d545e847aaca2ea1ffcb30a1d8cbb8/37924990775.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/2b66fe20fb99471d9d0a3607f12bc799/34757396136.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0749ceadafb0f5a0919f8ff78e41b04f/18544566509.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5u2ennh1hgnqfjghmts6jq1as0/34431832814.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/1c2606811465370e7391fc510036f280/furedimedosikoner.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/vupewu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/259jur2l8g6grv892ij8okuvrd/95537463937.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091349abd399---7411284640.pdfIn PDF document text
    • https://landi-bg.com/images/file/vejorovutomari.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/10544495947.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/13478642032.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/43479133475.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/tofojedenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+are+the+stages+of+sugar+productionPDF 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_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 17688 bytes
SHA-256: 525a50b255fa56729f53b48202bce11f61f0f767410f431c8114b0858abab36a
font_01_sfnt_off00012762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 10948 bytes
SHA-256: 2461c49d18e1d05118079af009cbb63383fb349542eabd6fde554ed321fcde51
font_02_sfnt_off00014093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1