Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25217606f2b42ca…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 22:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00641699eb0e93452e9605f95c9e8979 SHA-1: 27d0761140bb6debfc1d29ff497d00a4bb5e7562 SHA-256: a25217606f2b42ca353588d53cb005b7866fe3fa2474a19f32824e6145a81ad8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of links, many pointing to compromised or disposable hosting. This indicates the file is likely part of a phishing campaign or a link-farming operation designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://jagamimpi.com/contents//files/tavizifib.pdf In PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/kenabufonelube.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqg71e6sce7osi5ffdjh3k2kr4/lovibawisironavuroj.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/14553016652.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ffd4194aa121832c27ca66ba25f652df/nusudifuzowosuxesoruvolif.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/setikonolilumeravoje.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e68ed0edb98ef02c050edd991ec1ec1b/rexiteridap.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/xajaxunaxeliximowuti.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zelado.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021629316308221.pdfIn PDF document text
    • https://epiphanych.com/images/file/86249681735.pdfIn PDF document text
    • http://dges.in/userfiles/file/wasawizepejatej.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/fovarojowe.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160df7eb2b1cac---1945774630.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/77186821736.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc5123a81---dulerisivolexaxadoxuler.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/dimegawudowutexurosani.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/34584043043.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/rerutof.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/39386932975.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/4087258720.pdfIn PDF document text
    • http://mopron.ru/upload/files/datidalibelulujunuwiv.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084de2f73319---tukuwosedawuminomowotewo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d8487cea0---4728262538.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/diper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=lactose+in+butterPDF 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_off0000bd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD10 10376 bytes
SHA-256: ee953f10ee222a488ccca434c6a3cddd4500b923c17ff86414c69c037345e74e
font_01_sfnt_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 16928 bytes
SHA-256: e9b17429836e58a8ec27a70cb1a312ab66c05573fcffd4ea90fce86dfb1c5e43