Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00775f1e3651d5f…

MALICIOUS

PDF

91.4 KB Created: 2021-09-20 16:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae6fccda4c08cbd3cd6eb35c37f5f8dd SHA-1: 522cffb41c8b859aa12985bfecced6c8a96be1b8 SHA-256: e00775f1e3651d5fe92c97dfafe0225ecc80fa65e6ffbdcdf6bd7f31e9bb3466
204 Risk Score

Malware Insights

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

The file is a PDF that has been flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The presence of a security bypass instruction and embedded URLs pointing to potentially compromised sites suggests an attempt to lure the user into disabling security measures and downloading further malicious content. Although no scripts were directly extracted, the nature of the heuristics and URLs indicates a malicious workflow typical of a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://limadelimon.com/images/file/18914343596.pdf In PDF document text
    • http://narzedziascierne.eu/Upload/file/62043313793.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398d0908c53---59845632118.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/44490969454.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0cc252c72e36491579040dbcf8710339/gopuzeselobowopefunogi.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4fc24471cb440e789c588d5f97181250/pobuwinabezepanibewiweb.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/dowosol.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/24446742493.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/dirufuwemipope.pdfIn PDF document text
    • http://tid.vn/upload/files/doxuziwekivivipoxib.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/15886103133.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/xifulazowumepiwivimiset.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/digilolovadiburo.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/62690356910.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614203bfbb269---wiwadixut.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/69520906027.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/batewipejidopujigugelozi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/rizoxowigabux.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/tegusima.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/vixekuvifop.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/zawiwirakasu.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/41599282612.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142df64cc1c7---novolukajobonam.pdfIn PDF document text
    • http://arsvet.ru/img/upload/35887173061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=riptide+gp+renegade+game+downloadPDF link annotation
    • 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_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 10700 bytes
SHA-256: 3fb95e0ec0f8ba85f509c3a9462b6779c19467067d8a8d047c4c877984a355e4
font_02_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 19040 bytes
SHA-256: 60cfbb6ea4d11e4f7f35285997b825e13366bbf8ceb94d29f13662b22996dd01

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