Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdfcde72d58393b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 14:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bfcb2f2fcfeda8053d9eba1706586db SHA-1: bae0d51aee1e925e3f86724180c2bbfd7bf9ee71 SHA-256: 9cdfcde72d58393b055319ace4fa0edc1aad1fd90d5a3342dbe9bfe1c473596b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lure users to malicious sites. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=dharmendra+ki+film PDF link annotation
    • https://cbconsulting112.ca/userfiles/files/judatibobe.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/12545576129.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613190377b96e---89238766027.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/zakoxaridujavib.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/tuvijuteto.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/84216881693.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f265ed0719---31755055640.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/xasuviwulepirudozudife.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/xolinito.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/97520680751.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/14089961140.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/vozafepilopopefamakos.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/82555467728.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/bitogononeripixiworoniz.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/jajazarojanemo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c7d6fb96699e18d67b454759e389a0bf/kodaxogixikuzofow.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/96321357068.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/66909134556.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630699681.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/pakorirawokoxefuv.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210901_57E97F2324506C4B.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/52726793771.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/melefuvavirubawokawibos.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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 10328 bytes
SHA-256: 4b6e35a99c6443ed7b143bd774526d542a9ba2c9bbd4bf4eb5eac7ac6bd50dde
font_01_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 18280 bytes
SHA-256: a040eab4257a5a9a39f8c16ef511a3ec0bdd55f5b02079def02009631e7b9a38
font_02_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1