Malicious PDF — malware analysis report

Static analysis result for SHA-256 9181e8c5ea715573…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 19:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 23bda1a715707159fc5fa8ea17653b43 SHA-1: 07072e3ce07986e8ea71ab5f11cd3d12780bb6c0 SHA-256: 9181e8c5ea715573fb74bf0dca6ebfa2875c00a904a3bfade2c0117e7da92ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=antianginal+drugs+pharmacology+pdf PDF link annotation
    • http://westernstudioservice.com/admin/userfiles/file/xusukekikegitowekoxifoki.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/40701090549.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7d4b8d31---keboxujavifuneguwu.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/41836444386.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/kuxobefeguginigelokiv.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nivumapukemonase.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/11688641646.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160968bae80975---nukudenigukuduxiras.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9i31j7b3e5ch611u8pl0gkvtlg/fizodedimuxovofupe.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/bizupojikuzosijisekiwi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/ladajilu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2c27067eb38ce675d34b2d67a4204412/zazuze.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/remaxevevimivoxupog.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/658896e05bf9fe4cf9f82e3a02bdba30/65919267042.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/14757250715.pdfIn PDF document text
    • http://dnepropress.net/files/file/57682752640.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210531215352.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/51845823567.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/nokixaxupove.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779063b2c10---nilinonerade.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609e154c751a1---kegelituvuvodibuvonodobi.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/sipimodu.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/55274888358.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/46686592204.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_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 11132 bytes
SHA-256: 4b4ae3b36413599ed92b0d094d7df60ae909ac9927a57819d7afd61e7b352c69
font_01_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 22136 bytes
SHA-256: 2066dfd63766bcf9015de372521787d771fc898ff7e45d633648a05cd62c4833

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