Malicious PDF — malware analysis report

Static analysis result for SHA-256 408942bc3aa7b707…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 14:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52d4302a1c685481becf875bcfa3dc78 SHA-1: 8d58995b71b781391c9fd7c86f4aacc83459fe19 SHA-256: 408942bc3aa7b70776fa28e626f9dae5b0d324818ae7cd4fdd5191e69a807a9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ipic.vn/userfiles/file/kupodevasezupi.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094597d917a2---43969371954.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f936d9a6---63795419638.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/13949824640.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/48843857858.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/60042874374.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/bekagokituru.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/nemipo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/48su14qpvc2khn9sg6idlkfgee/61705431047.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/69713287178.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/aa2fb33123d894a69bae94da3628080b/41830883442.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac49ea41bd---9745219233.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/81635173849.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9ea04e41---jogakox.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/vomazokegeledivutof.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/95083597f971a61ac7264e1970782f28/70903384065.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210613210036.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/wivizolikomegoxozadabi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n6eonpq8eddgleqjmqi56jshjq/87208187026.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/polox.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9aa51b07b35bff75dcf3c62cef8ec123/43169124493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=oscp+exam+guide+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_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 18800 bytes
SHA-256: a3c2e51917f39f696798df2283a5cbad81361a88f8d2fe424eb5901e726551fa
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 10720 bytes
SHA-256: 1346bd4cd715752bde5ce107a1e24980d2a4f62340c194001660cc19d47cae8a

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