Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f21297104f3bdf…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 01:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc957dfc9ed450f561c134e3aaa70fa9 SHA-1: e284bf3c96fd58d84a6fb0958401112ab7721afb SHA-256: e9f21297104f3bdf464aeb19fb04486d8a3875a5629feee220ef2573db978309
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Additionally, the document hosts a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/cf4c9d2f9c6b7f162db135d0066d7683/karom.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f566e6891cd---pekezusuvilemarafopi.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/30461029838.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/pavexaxixewe.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/27369746246.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/bivenelukibideguxo.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/65867130761.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/50648646795.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/bepenajarivav.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/misetuwarug.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecfc0fbb269---75378372995.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/guvibenivupipom.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b522f65fd0af0727a51e078cb85a5e58/pululu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/gopuvawuzatejokot.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/pasirajomoxedokunizolen.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160770eb12aa5c---kabuzoxazumub.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/bovoximejebezobaro.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nctjh3flinhrl9k4fjg42cle02/56492785992.pdfIn PDF document text
    • http://markone-tools.com/upload/files/18673583286.pdfIn PDF document text
    • http://24cvety.ru/upload/files/56399808928.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d24ba73843aa15b2280390d2e7455f97/46332493757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sheet+metal+cutting+machine+pdfPDF 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_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 16616 bytes
SHA-256: aead03066dedc9ae27c8c70252d5c36ef27fb94174e5116c6c55dcdfd5006a7e
font_02_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 10852 bytes
SHA-256: 4d1948fdfec7fccce6e234597a50225bf85e6ead150f093f6c8411b056449228

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