Malicious PDF — malware analysis report

Static analysis result for SHA-256 11795f6366fee47f…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 09:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40d4daaab3703b56476b7123495bf854 SHA-1: a54292baa3ffbfcd8ad03a8293c264b4bf6bcbc5 SHA-256: 11795f6366fee47fa5b39e5d37b7eba79d38bd303b332bb0f8bda73e43b46afc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised CMS uploads. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/91e110f1ada3252ebc6b276f9174dfad/tobogagiwus.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3508ce78f2---tebufotazuwavediriget.pdfIn PDF document text
    • http://susutour.com/userfile/file/kozoruzuwoxaw.pdfIn PDF document text
    • http://fitviewer.de/files/file/xoragekab.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/watofuperarazabamifufen.pdfIn PDF document text
    • http://gtshotel.it/images/file/6845724847.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084211d554d2---73331219984.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f5a286d88b642721791af14f0bee701a/20025271391.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/36387251841.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a5fa38780508d296ce9e737e97ea7f5a/nopabolitodanaxamavedasa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/88262868705.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/9vne3dec9glp4eur1isgnril74/8103129786.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/powivufuv.pdfIn PDF document text
    • https://davaocarrental.com/images/file/lewipokavolulopirusene.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761a1d5aadb---9979065638.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202151313945307.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/dulijenenojokitunufivadix.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/vizulimiluredaf.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/sekufu.pdfIn PDF document text
    • https://webhosting4.net/media/file/51867934120.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/junivexogep.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/26546718060.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/ruxogowexidigunaladixim.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cd269d12a---28586090463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+good+vibes+meanPDF 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_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 17644 bytes
SHA-256: 2d9c14c612bda46efc16bdaa877ef5ff4ba3098f03801d2960c831cb98209e6e
font_01_sfnt_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 10748 bytes
SHA-256: 2ed86f979c6f2d82f46e79e415f9139e5ad635865e974fcccdb86880d1e00d98
font_02_sfnt_off00013ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1