Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c83bde2e17dafad…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 03:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a590f7c825c1967b7628495e5e790bc8 SHA-1: a74c2aca3d4c490cabc2392c822b89ff6677b5c0 SHA-256: 1c83bde2e17dafade3b6dec723ee39d656d58922354cf89b9d7d1fdf64f90b57
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=how+to+hack+wifi+password+from+phone
    • https://soyana.de/js/ckfinder/userfiles/files/bojidagawigev.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/37ea416718ebf5f0f4e47d37cc803591/20933447989.pdf
    • http://narcisse.sk/editor_uploads/files/goxikenem.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4c77590b---datirunenawefob.pdf
    • https://adikmanis.com/contents/files/jujuvuja.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/11426496306.pdf
    • http://uticachemical.com/files/upload/files/14377084710.pdf
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/kelodolenitixuguremolilex.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613909e763c13---dosukosup.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/poxitufanuziropedilodim.pdf
    • https://davaocarrental.com/images/file/zirasufosazuvabelodos.pdf
    • http://tai-yang.tw/taiyang/upload/file/59058390691.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/guvubixorelepuzunud.pdf
    • http://twilaw.com/files/files/20895204717.pdf
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/54434308846.pdf
    • http://aal.tw/uploads/htmlupload/files/92042379190.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb61753762---duzilupigetixagafu.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613177dbb285b---laxofujalorakurogafawese.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/70195a7bae9760cd6fd0a4b5bb5a5dbd/zudanuvotufazopawop.pdf
    • http://mothertheresapublicschool.com/userfiles/file/9683130511.pdf
    • http://linuxnewyork.com/draft/media/46035348474.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9c499e780b558f289ad620b1fd962348/97293189440.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 16792 bytes
font_01_sfnt_off0000fdf2.bin
35f0e3a4f8363e3d3800bcea9e940ae6d50260946265cabb2d855f7ee5b38746
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 11008 bytes
font_02_sfnt_off0001176a.bin
d6de18395dbd56f072cc28fb82ee577742c7fc4d54d37fd34be8cadd82710026
pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 17440 bytes