Malicious PDF — malware analysis report

Static analysis result for SHA-256 365557f8c2b6952a…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 07:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa6e4a86f65ed538584b7e1bab1a6d83 SHA-1: 51e2de54a1118c9404de28bd9615eeca93d2f7c5 SHA-256: 365557f8c2b6952a4c3aab104355a4cdc45117f65e95d26602b584e000353be3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or exploit vulnerabilities. While no scripts were directly extracted, the PDF structure and link farm indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9fombfm9uvhda5ustji5gg6i93/sudebosu.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ff4fbabd7cb9978499c94e1ee8b44045/puzelutazotomix.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d9ece246---74842880143.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d424369dce26630fbda5a37809d6efd/89999808937.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d95e715e---68855735157.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fo34r9kdotdc25kjtq7p43tl73/wonofunesilajoropali.pdfIn PDF document text
    • https://beaszemin.com/files/45767292191.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8ssph4aji43si671pr9h26a927/60695625135.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160863c7787ba4---dowamorupuwalusoden.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dnuipdhpg6ppa2mcbba29l3534/womuxafipoz.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2f2d15b4b5bcf966c9697ed47b7bc099/latijozofuxezusozolalo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc0e4ee4d---40584192625.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/12800301973.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/19739375991.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b1ac260fa7df1ba55fa3e1b904bdf73a/80201430584.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/26578805693.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607092f473e36---bipezoxubikin.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/20809752064.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b49e9f882ffa3a3aba6a7095783a7274/kenetirikewerofigerowira.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a0phleredohii8nvli69rs41eb/varowigefetewigivivepowu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7fdfecae2b---57090229042.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/selozus.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83a66c08d---nudegebowovudej.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d9fde5d3f5549ce21e27910ec7d3eccc/fasiwokitixuj.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160740bfd08739---dutul.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607330b8c82d0---36015371486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mixed+methodology+research+designPDF 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_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 17252 bytes
SHA-256: d7702802b3ae40d115092a6298035451fbbf6a8ec87449b24580bbf69e5fe46b
font_01_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A50 11024 bytes
SHA-256: 0ed82192a6f1b3b08f3adfa111079b10a330713435ba38db66925d90df18408c

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