Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efde9ae1589cb97…

MALICIOUS

PDF

93.1 KB Created: 2021-07-29 22:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 282b109025b31807434256a77abbc30b SHA-1: f39d0dff6a917c86ce978b826cddcb4b19752ed1 SHA-256: 7efde9ae1589cb97a51db989e8a0be5055f422ebc866280e33f254f216d149ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607aadb1d8644---tivofimedikavoluxalojosa.pdf In PDF document text
    • http://bagiez.com/userfiles/file/muxizomizafev.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/87399333603.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4645bf4de39350554dc85b93730e9e9b/bavidojojisesibenobuv.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/nejojigagim.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/f236b47e802354d11923d59afabbc7c1/xasute.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817858cba05---wulewutanuzuwiz.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f08a710936d---xipozobukugusadum.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/78742972245.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/058844481.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/94385756314.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/43655964693.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d5d6c43ad4f689610988998fd037f02f/kojuzedogasufese.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/61345904521.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/478fa7b823922c7a21765aed190842d4/19034949886.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071e89a6579e---53883795709.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc908b04a67---kopum.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/8b751f30d3662d10e5963ae324389c10/novev.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ik2u27miamevk37u0a709ckkdh/jopewitadenag.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/danak.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/39091480938.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/gexofuvapesomawu.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/689c02d564d0987b71d64998f0de9d7c/nimutopomidoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+dyson+for+pet+hair+ukPDF 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_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 17840 bytes
SHA-256: 98ed4ca191e77c7aa30f8b768c8980f30588ee50f241f7b6626c0ff6710e9743
font_02_sfnt_off00014cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCE 10908 bytes
SHA-256: a59796cf6e7ae78043cfee0b390d1468682112bf936bec6703ed0e3eadac57aa

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