Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b711c06a0bffe2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 11:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f8d490ade83245dd3a0232bb447365d SHA-1: 583c8b2711d931bd3504f7ccd1fab217aa0afd4b SHA-256: 24b711c06a0bffe23315e2a0c339ef672ef4c851f19d727f9befc422708bb6bb
164 Risk Score

Malware Insights

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

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains embedded JavaScript and numerous URLs pointing to various domains, many of which appear to be part of a link farm hosted on potentially compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=lamour+premium+mod+apk PDF link annotation
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/xajido.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/nakudenabarem.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902045006.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/wemivegojamewifo.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/rutujuwisufapiwixuvurogon.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/61877574001.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/xazomezal.pdfIn PDF document text
    • http://fructusartis.com/i/File/76250987498.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd59f1bba---20431183082.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137a9a624e48---69173061105.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/52686620918.pdfIn PDF document text
    • http://yztools.com/images/upload/File/nerirovixuxo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1314a451---26753161731.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/s0bhfg8qk7u0qhlvjnp548b8r7/83295143962.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9m7s2i39fmnp6s3eq0opn8sktd/47490477167.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d182e37777---10002924583.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/39349819795.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/xomedukizonesupos.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cb15aaa4d999853d22aa02771894d89d/23866808538.pdfIn PDF document text
    • http://belv.ru/userfiles/file/sojojoxiwipawexefolenoju.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/9132852166137d0f5abe7c.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5287e4066e7a4840afeac15f2b6be5b3/28801943632.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/namexebumefewedoramol.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/35033615250.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/17370425514.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_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 17496 bytes
SHA-256: 90e73ace4bd918b3f3d775e45b84547cac558d5d824a8f00fbf153c621d2da99
font_02_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 10284 bytes
SHA-256: d927791cafadf9f4888414720b0d73c134f6f6b3fcd9b81a2dbb21b3a0e3c30a