Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8ab1a4aabfbf2e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 05:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d091ae8d2e8fa76f357e655307ecaea8 SHA-1: b1f0b48f5678104450784e0296592af6131ddc06 SHA-256: 4c8ab1a4aabfbf2edacac67c4812a7d6ff974f2dc39308e9f1dbbf9cb9d53619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://aquatrustfina.com/userfiles/file/85596242619.pdf In PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe47de88f5---kusifuwo.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/milogejejimupudemoxuru.pdfIn PDF document text
    • https://cncunse.com/d/files/87516738386.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/23257903857.pdfIn PDF document text
    • https://etadelloro.it/images/file/jepiwuxiduvunul.pdfIn PDF document text
    • https://masihpt1.com/contents//files/87887359240.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/sofuz.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c166b6c54c1---29742243811.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/metesetosajizozi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b617c162197---pomezutetotuvaz.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0370876413---66642619104.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/wazosajuwokox.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/barelugokizosowifan.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3098fc77---63806762083.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a43147140106ec1d4a67e70bce91605e/84610256748.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/81das2o56ts7qfci35bu44rdro/84671103988.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45635931022.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ad0e1c2---30394121964.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/vikubenelavalulijaturi.pdfIn PDF document text
    • https://dm288.rs/slicice/file/jijap.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/27671289543.pdfIn PDF document text
    • https://oferta.lt/i/File/xefolan.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24d8dd4fa---ratuxuxeborinegikixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=labio+leporino+y+paladar+hendido+cuidados+de+enfermeria+pdfPDF 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_off0000bb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB03 16360 bytes
SHA-256: 5e3dfdac40d08e929819530829661376060e288fe13a80e09a800e3f8501d2c1
font_01_sfnt_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 11100 bytes
SHA-256: e3f37dd42e8ff538506358952b1292a42866525274315300e7f10047ee3fff86
font_02_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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