Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e5ae67bbfcf4d7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 00:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 806cc2ac4d3ab43f525f8518b0def475 SHA-1: 3c45d4f324db09aa43cae088727ba0e548777289 SHA-256: 89e5ae67bbfcf4d7658ffbac1b9213ba9a071ecf903173aca08d40257bd501b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites using the formcraft plugin. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea330f0a79---zuparolotanid.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609467757a0c9---vavolanazeje.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cd1e9e6b---solidinosev.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/wamutet.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee23b8f4c83c64b6c29355c9c69253b2/27602476573.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/gulusetivapenu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf5e6c38ad---19813781911.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/95215572193.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bedirarosasusuvetozufep.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/3f3cab90c0a5e23638d66786e8d14132/lavepifura.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/14081495404.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/lizipaf.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e898c552c4---mozepadap.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052519105870554.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/147ddcb30ce796af69839ef5db78627f/maxakiwoworidijudidopiz.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/kiluwevudokifukimukiweki.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108172117167419.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vagikoxirik.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a1c9648e2db9dd296026bf59a51dbf50/74291862861.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/22070618909.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/f6ktd9o3sf4rg9sf098fk3p82f/pagibe.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f3f100c28---74894915131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=service+manual+for+panasonicPDF 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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 17880 bytes
SHA-256: 5a19c5afdfc31f3e811a89ccffe96ae88827c80dca9c6570aa49ac86ac1dfbc5
font_01_sfnt_off00011079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 10784 bytes
SHA-256: 6ccf4da3fc88a554f0359e935cc4e4ab5b1d276fd00402b2f7c5bdb072d08bd8
font_02_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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