Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4060c8dbb3dc78…

MALICIOUS

PDF

98.5 KB Created: 2021-06-26 09:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9e0dcf3fe943198139ae66a276ada3c8 SHA-1: e2e062e07d907801ddb90d342d15f7124310b591 SHA-256: bf4060c8dbb3dc78562ac10d8b0606a7a0325c8a1851b02660a8b5408eb567de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://wastran.ru/uplcv?utm_term=sales+techniques+overcoming+objections PDF link annotation
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3ad489a716f092ce202e87f8a940779/kavubobonutenifekaru.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/roxuvafelaxifixuzikilag.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/j5g0dvva480o4098shr3li9cad/22252357973.pdfIn PDF document text
    • http://muszempilla.com/files/file/joxuropu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0gvfnfpjluh9amvh67562npl23/govuvidijinudofunipegedej.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/13790943059.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/53741db9b70879148c7cbf0f8e02f080/76693519167.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5e828b10200a530ae0e08b00f468733d/97815472817.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/resozejudaj.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/gufiburuxo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a737bea365---wabolerorefafo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fa70c5bdc973e37510d3e516703b2042/xafijo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/83gtul9q6sufqgndmo6an86k81/gilog.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210514001202.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b2f2d332---29799438628.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/d6na7bof759u2o4t9ss8i7lpl0/kojarewewivifapubulu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c7a19cd564ceb57f4d428fe60c0d9084/korapowujejefug.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/q1g3ngaq0op3btqstko4mg9p96/sulawela.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c577fa36---15142498260.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf195f09cf---dutujaze.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085208a0feb3---zofisavomurorabulov.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/mujodomexumazememovojabe.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/zemegevitivowusedarovom.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/oloid2fmicvo6cuuns69f3758e/risuporogafe.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b980ff4ea0491f2888641f95b58a8057/9868028338.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_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 11332 bytes
SHA-256: 197aa2bb10826749dda9bc76bd8153a693b873a1f02ab53ef8b75f13de391476
font_01_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 17372 bytes
SHA-256: 5c98d72ce609bcc092c61487fa2884be96e207d0622ed98df1924bcb5859ce07
font_02_sfnt_off000164ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1