Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eff2ae5230a7528…

MALICIOUS

PDF

78.1 KB Created: 2021-10-03 19:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 590ac7f8e4a4249d49c10ee3bafd4b67 SHA-1: d76cfd99c4c3b8d27f48e60d9da49b92a062f995 SHA-256: 6eff2ae5230a75289e36bb1a63c71e904f45d2f9cef9dd821df625f98dafcc2c
104 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The embedded JavaScript may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://newabel.com/ckfinder/userfiles/files/62048400931.pdf In PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/99825753734.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/66999298709.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/77705290596.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/27092505744.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/18949652055.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/pudajusatulidax.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/zotitolabegiwenoz.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/30917053539.pdfIn PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/kufijonigizupibi.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/pewabududodajil.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/52307661478.pdfIn PDF document text
    • http://goldmustang.ru/files/files/joxemut.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/47572288189.pdfIn PDF document text
    • http://signauction.net/userfiles/file/larozel.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d8a547b3d97033f54582b20817124f3e/68029269241.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/wikiwo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bf56f28660296cd37507d175c7940bf7/vuposegafekusamirebobasa.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210912073502_tlu3re.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614196b6c432d---gexiw.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/18171758741.pdfIn PDF document text
    • http://hkalc.com/userfiles/retavefegewex.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/98794403556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=parkinson%27s+urinary+incontinencePDF 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_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 10520 bytes
SHA-256: 705a99126b5d97cfdb9bebb53243169749acb05a0068bb1dbe48a4193fec0226
font_01_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 19480 bytes
SHA-256: 625c875306feb2b4af07c1d72a64588be405583e87c2e05f98c199e41258aa59
font_02_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1