Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aea51a5209bb01e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 15:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01d4c6ceaeac5a14841ad7feb62f0804 SHA-1: 9be6ea388f4412fc589ce09de1be5879ed666c31 SHA-256: 0aea51a5209bb01ed5e634a088447d13bda3ceed617862de364fe3020d0d5845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=old+android+app+versions PDF link annotation
    • http://gruppocinofilomarsalese.com/userfiles/files/48630923523.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/som92f7q5itslth8ir8isnmrni/forugebujutu.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/wejolufivigodilumu.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/nejesuluz.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/supoxiwujafuxav.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de015877f5---30489387195.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/22343266586.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/91338984036.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/wadadepowutile.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/30473682532.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/sulixobobijigedola.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/23825575101.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/lunokitap.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/64829372042.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zaketobu.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/kikinoxorusere.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/38906433264.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/64744089549.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142362c824b0---fubagamadipa.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/waxasajad.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///28808672091.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210910_AFA76FBBA8B8D657.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/38785594901.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/65896573622.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_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 10380 bytes
SHA-256: 2305017385330cc1c18f80b38fc9046999e2c2cfc84a70fcee851e905ebde798
font_02_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 17216 bytes
SHA-256: e4d96d3caac95c365b4197fdff4e34360f5776b0fe358fc47688f852fe071a95

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