Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08ce08b77571291…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 20:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c67d1fa58c4a1d97a88521ed50a90a02 SHA-1: 950ce710e9694b7d00e58497135277c1f80cabc9 SHA-256: b08ce08b775712910e48f499e47f5fcc18263df9bcba1d783b36f9c35e29ce11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mu-rrrc.com/userfiles/file/jatejuvumogekejaneza.pdf In PDF document text
    • http://ipceurope.eu/assets/file/semakobamofufefufebojefib.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cad994197049b5c6149c29282edd0ff4/51813558341.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/66f0d762908de44a081457b96d87b031/wobapusosamesipa.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-24/20210524010306304519.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/nodivubigupafumurezulib.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/bosufanalaxiwanagunuzuv.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/5087912936093c8eb49f08.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/galalozudataruje.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/45333281973.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd2890f480---pojowinibemodulezono.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/8q0mrt2tcahskghb6fsvpgiqqc/53995905890.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b20b65893fa75f7cca1c3b6f6ff12c6c/lumonemezodudukarulo.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/pupejelisumidazuzof.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/62087120458.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee870d0f0---74992068399.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/be263a80e4f7a10ec6ad2db70e38852b/buxab.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/rafibexibu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5b8e4fc5048a86a211ef7e9f1cd43dd/turiw.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608430d2e4320---wugisalowimisezeda.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/f21olnc3ko3kj7ectcbta91fut/34857849080.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2b69e832c7e3068d48712582385a51ba/32281174975.pdfIn PDF document text
    • http://ipceurope.com/assets/file/tinowugivoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=contended+meaning+in+tamilPDF 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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 20656 bytes
SHA-256: 8e35aca39fe9862a6bb993f1e76482666e57073fdee31bcfb95d6d60ef2d4ffe
font_02_sfnt_off00013ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE0 10352 bytes
SHA-256: 05abfeff34e9e3e7523d809d989f9b546929eee5eb248c95e176a589473e8827

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