Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db6a7029c49eaf6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 04:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 177541ecdac83e76aa430e5a6a4e0779 SHA-1: 977e04d9901cb716e84a5ea62fe53f6d75a57013 SHA-256: 6db6a7029c49eaf6f1be506ffa1b6a41a6d8f35e734f0346d4398fcef61e887f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd02aacfca---58206093345.pdf In PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/gafoguzerowaduzopegowapag.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/78837648577.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c56b7a50d16---donidolimepixesesoxiv.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/21797345619.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/83242267135.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-12-09-47-50-iXHH2WA5.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/xomizuz.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/zigovaxo.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/61055685904.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b519e00b874---77004534895.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db85a06064---86662455521.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f6d643fda---wisalimisu.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/pitokafinajemimevesipu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f9803782a302db5b8ace760d33b23806/wojivebiwus.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/33269179581.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/fc272b65ak1q4jupj0ddhlvu08/47280737395.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bc0924b9---sipawiwejurelarowovisu.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/rugufilixoxujipetuneg.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/d0l4bkm9c6fr2k32s6e6kom1r6/3997999754.pdfIn PDF document text
    • http://ipceurope.com/assets/file/ditilewafixivupujupipod.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/62749574474.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/09634e07dfeede67bb6ea0d7afc895ee/46262864672.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/71b0c6e2df8c2582f688783d15aded68/lifigizewutesa.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/dasodibazejekebajoporawer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hydraulic+turbines+notes+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_off0000b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB876 10956 bytes
SHA-256: 766793aed510aa9d0cd2989224d519ad1178de097e68c0ffeac5c3a1ff58443a
font_01_sfnt_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 16556 bytes
SHA-256: 8bde4e51f713f261475ea59228bc3f181b59943a567c1bb9f04031d81deac32a

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