Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1a4f3fcdddd869…

MALICIOUS

PDF

88.4 KB Created: 2021-07-21 15:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fdc7a89576be249a9a1a4818448369e1 SHA-1: 2a2079671de0ee9c710cfdc12792c91449a58b44 SHA-256: 5e1a4f3fcdddd8694c16156f89f8ca6cf347ba9130db6984a25b4ecc034a617a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160803ed361634---1475012372.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b83e55cc---62908591864.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/luditonabowerapofipameleb.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/sodidaxesujepir.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/xupija.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5079b1795b---61641367434.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2dbc21bd---jurasojig.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/19063433989.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/mewetefezoju.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608265d79efc2---65645005293.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/92466995613.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/jolaxegiganukujemiwazij.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/92917786025.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/67802465822.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835a20662d1---vabidanisikojuf.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4af86a44---sanemowenomirelanekafi.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/kuzafibomitelose.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/sojugap.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a631e267ec8---94665251787.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gj1a36s70q3d1rs5psg0i3fchh/79349335467.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/74486323973.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/1188104700.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf0d80ee3---75611349063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=interview+with+the+vampire+full+movie+onlinePDF 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_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 10660 bytes
SHA-256: 28ba113772b15ff93e3353f4636ebb711c06c62620fe7c2853960bd0425fd8c0
font_01_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 16992 bytes
SHA-256: f59f6c2789d3cc5b1e9c96831b3fc8bd6bf9b246c386f3d74aae2fd95cdc7815
font_02_sfnt_off00013b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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