Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ac6184e95714a7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 05:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec9fe8a850e12b27825979242164650e SHA-1: 16b79e56b387b39112e790b112d45b217a938c73 SHA-256: 70ac6184e95714a78e19a365c65c0b159f34b0d56d9eb5999a9291392837b72c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier 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 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://immobilier-valence-agen.com/userfiles/file/86778189867.pdf In PDF document text
    • https://serihosting.com/calisma2/files/uploads/pebokedomuwejomasofudus.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/18111271333.pdfIn PDF document text
    • https://2winit.com/Files/files/ritumitarugag.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/gebivitilegal.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/90698029708.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/gojopo.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/belatefud.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/53394181392.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbef234ea---dotegodisiruxeruloxi.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/64583162659.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wovozovenijipalufisu.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/vafagupulokisovenijareri.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jovewavikipitoxexolitunu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/84d585dcb7e1ac56df0f26ab10aa3c3c/90952729751.pdfIn PDF document text
    • http://aurora-c.jp/files/files/62182018320.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/nuferanarudikakumiro.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/janened.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416aa6062e3---56045710455.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/jugaliza.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/6639553237.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210912192959.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/51921592901.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161464d644d46e---pemomikuzigotidagunefizav.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/24987231386.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614332461b1b6---jagabejulegef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=good+newwz+streaming+onlinePDF 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_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 10776 bytes
SHA-256: 23572e6169f72120e2e51cf1a7e377b486a668792dc4cd6deb247f80b4e38c3a
font_02_sfnt_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 17316 bytes
SHA-256: a87f21fa81ed09a69d03dde6c0e284a8d3e1754b900b4a278c523aa90d06f8d0

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