Malicious PDF — malware analysis report

Static analysis result for SHA-256 711cacb2ab23608a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 07:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4717077c82adc3905d8f3996451d01cb SHA-1: 310aa7f73a72f33c0146ccc52a053e74d2a3c43d SHA-256: 711cacb2ab23608a3244b7f91e2b3e72788605ed0cca465c3b72bcd1f765b74f
164 Risk Score

Malware Insights

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

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code, likely to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=photodirector+cracked+apk PDF link annotation
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/38309566579.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613add260d09b---77635891138.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/kuzadobizu.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/27266884001.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/dknvakjfkdrldmd9vea5j3gvoj/soxosufaropanotavawizoj.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/sufenuzuzowura.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/6200230095.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/lefodewiga.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/zezitaxenurugamomakojino.pdfIn PDF document text
    • http://446888.top/userfiles/file/72793603706.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/birisivedupivez.pdfIn PDF document text
    • http://carbonelite.ru/file/23347631098.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409d35c4edc---35605019809.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/sexuromagerovu.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/61406001413.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/67102514326.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/mepebod.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/76853000575.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf57b6d00a---84813382529.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8ece55d1---13555021419.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a9c5ea1af---tarafigipexufijusam.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/zoziduzaxakapixirugu.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/88369677617.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/82709036794.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_off0000b902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB902 16868 bytes
SHA-256: c6f0644cc5b031a549aa50c084a4e8f9b840bd26e313ea38e102c32072598ab9
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10388 bytes
SHA-256: a5c82414457b7ccce6d9c994a6aa93892c9d08cf2076806c2d98e6c50ef12ed7
font_02_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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