Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d531f5eb3bc32f2…

MALICIOUS

PDF

69.7 KB Created: 2021-09-03 23:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e545d104198ec7aa4338d72f5b091893 SHA-1: a8928a80f13781a8d50fac5b93485da76998ed6d SHA-256: 9d531f5eb3bc32f21c1e4a4eb74b57573c10349d0380747e2e19905f527f3687
184 Risk Score

Malware Insights

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

This PDF document employs a screenshot lure, a common tactic for phishing or delivering secondary payloads. The embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=rythu+bandhu+scheme+in+telugu+pdf PDF link annotation
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/nidurirakuzeditoz.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/278c0f0988b6d15132d6736d5a6f8cbe/23735642571.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/93902010556.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620864858.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f5629259182---mumifufubasubar.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bjilk4v26ga81a3kakprrjhn1k/30310857682.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/14613758995.pdfIn PDF document text
    • http://ruresept.ru/files/file/befinokisebazaxur.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/xenukogefu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/pekidewusegomaxosutu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/23fccafe6a1cc8a04cad60e20570e2bc/bikonin.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a317c07cfc8---tiregixumakolaro.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/nedawerolewumedovijawi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68512c218---vezelakipesu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/83a691f2f03baa752e1e9c7638b1f134/komelexowemalu.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/neruvivusonawewajej.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/roleb.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/bitagidavakaligugo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3912b1ee53861a6430b1a90b85891f0a/wixexuko.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c49fa639980---58908906032.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/rutuwuboxituwax.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/zamisegamevik.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/latixitaninej.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/eedbca8cb348d6abd3d5c74b76c5ac17/29175664243.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/29128715066.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kumafag.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_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 14116 bytes
SHA-256: 909fa1e89340f049cdb5b83324248a920ddcd186ce719f7792876c1a0665c89d
font_01_sfnt_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 11248 bytes
SHA-256: 99705f29895d813ae22de09e488fdc71536f32fb0ac344910a62d8b6af4debb7
font_02_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1