Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9afba5a537e336f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 09:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67bb98e1686798a62a30cd17e2d2c0fb SHA-1: c1a51918f6a2c9f03c8e067bbcd98588ef35f048 SHA-256: e9afba5a537e336f4ed02f8e324c3b18e1df2c3f0bdbf80f50e1800ca4fbe19f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or initiating redirects within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=sintomas+de+diabetes+tipo+1+pdf PDF link annotation
    • http://casavacanzesanvito.eu/userfiles/files/pemuvip.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/ganofunagabezalogaj.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/47450011392.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/gemogijipavexag.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/janijib.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c926cad1f43---15058987361.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/34448006107.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/17638884313.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2se6r33fifqc7ujfpvsn5m6e67/wukozirupisasufapuxowe.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/xalagafaweser.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/81315893585.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/famarapo.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/99854120433.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610392b7833f4---39844191902.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/68597723689.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16086a31102d6e---vovixebarerufejexoxa.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/86596235880.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/26237289052.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729fbce3d80---jipasijibinudi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b300a4e252b---giletulunexo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b08954d991e---rokekusumivuzun.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/070qvkh8fduq91t0plni2etot0/kuzezemujosapuxeluf.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/35361621462.pdfIn PDF document text
    • 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_off0000e39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 17836 bytes
SHA-256: b30df27934fc30e96a508ce7c4ee0cfdffa4c7e83d24bb4e45fd1fc9cb4953d1
font_01_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001297b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 10780 bytes
SHA-256: b98fab5ea3f375bf0dd67b7cc9f93a237d1d53b447856e10a998bc6fcae39c55

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