Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91f26cda1a6eebe…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 07:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a071486a283ceef0f3f2a75299bbdb5d SHA-1: f2140dd56a7b70e594a161ea0c78e5da70e214ab SHA-256: b91f26cda1a6eebebf3f7b49e7c18dda064915ce7437e71bb8859e20656b4a35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=android+sync+apps+from+old+phone PDF link annotation
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8hufdhnpjfq7t3tcrf6u93ds5n/86236785390.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/92854583135.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/3544920637.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d504bae3c5---datexuweka.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/tubiwotopuwituribaduvo.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/93262849935.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80493059468.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/juburasosomu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146ce653171a---94391988038.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/68623006738.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/71349843241.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/38300049669.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161335e69a37a6---tazumanunonesu.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/kelineganazuzigenolis.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/daxuken.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/63095840768.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/73368674173.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/83495866126.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7u0gm6budf9glkuksaaobe4oji/94650644310.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/87530878734.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/rijuvuwujo.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/14871708580.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/dotawafimafiguwadumilefiw.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/99919857299.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_off0000c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC780 17460 bytes
SHA-256: 161691638f7bce88bdd4f4b43ed6f33e45704564fc53cf6fd38cd828917288d7
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10884 bytes
SHA-256: 5534521d93635a82e9ec416408815d9310016ebbab8a7e3c8bcda3a107e6a7bc
font_02_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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