Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ce03320f634dea…

MALICIOUS

PDF

69.6 KB Created: 2021-09-08 21:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11f830b16fb3a58a828838c69ab9033d SHA-1: 761ebc608787053fc139c83bbb26bea6aa9eca99 SHA-256: a0ce03320f634dea4fc5c1e15698e7d1930a5969fa79c4b6aed6a2a2d07c452c
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the overall structure indicate an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://rsebolivia.org/userfiles/file/75716803953.pdf In PDF document text
    • http://knauto.com/upload/file///vodevujizele.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fivibujekimoso.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/vogosalowexotiko.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/45504589733.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/6005755730.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/bavavuzowo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/litntodhglfmtk8rt5kkg9ubur/23268427037.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210901084958.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/75990859946.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/sukelipev.pdfIn PDF document text
    • http://aven.su/userfiles/file/girusigaturimerifujeru.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/46557154197.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/34740513856.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b0d2f9942c6332b3caae100926529cdc/vavidafazilemuv.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4134e228---tulizomago.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210902084557_n1usw3.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/bupotuvitewofuranenux.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/49733509568.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/rixiwuxosexigibipagulita.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/87626888494.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/wegivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=attack+on+titan+season+2+apkPDF 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_off0000b0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 15856 bytes
SHA-256: fe0dfcfd4ad0a8061cc0437cb7d0a5e644abaf7206f5c223c2a03f7eb52063e8
font_02_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 10416 bytes
SHA-256: fba6c8bbff95095c4fb21d8c4d48ffad67245d628132b95ab14b1f08eb61b38a