Malicious PDF — malware analysis report

Static analysis result for SHA-256 94462ea9f6fdbdfc…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 05:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3b5fe5eeba39b8e49724d522441da9c SHA-1: 5f570d0d5bce380e14d5d3624784fec18fa6ca89 SHA-256: 94462ea9f6fdbdfc1a9023206e40c79e8417223a1d8c2bed2f62b9d305da4315
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 ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.pepinieres-gey.fr/ckfinder/userfiles/files/xoxawexariwopigexazox.pdf In PDF document text
    • https://dsverano.com/UserFiles/File/59703725115.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/927e05ae85ec798446f60dbd0313d260/kerorol.pdfIn PDF document text
    • https://onecre.com/images/content/files/poguxuputixuvoguwulumogu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/85388348278.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/52351128520.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/18946082440.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/38502654409.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/54908471576.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba25c3c9c---3864087565.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/novuzuzixibiketum.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109072327089634.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/56248433418.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/62692786194.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/venumefikuduzewakuwena.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/95415140846.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/wegozasederogin.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/81467057801.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/87a76e6fc9f909325409156f5c4d4db2/44183262234.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/tidavuzofoj.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/45639382619.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/74326413665.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/bikadomuwid.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02a349fac---fumikumijumuduwokomijizog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=aaa+cash+apkPDF 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_off0000b6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AB 15480 bytes
SHA-256: bb04dac00cc66b2fee0de63b47e683f4414f6db7bac8285c68a83f6679230634
font_01_sfnt_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 9852 bytes
SHA-256: 2d4a1e79197aa7e1573cda990e567bae490deca70eb26f415900ea6d17b8a1f6
font_02_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1