Malicious PDF — malware analysis report

Static analysis result for SHA-256 15666fe35e487a3c…

MALICIOUS

PDF

107.6 KB Created: 2021-07-27 12:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1974a5c0d7bf2711d57ed51348bb501c SHA-1: c4b40fa06a942106617f3e7a583fb347bd1da729 SHA-256: 15666fe35e487a3c052cfe82be8a97803aa0add619c06c9032e3ad8f7523dc1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://vaness-sens.fr/ckfinder/userfiles/files/81565530312.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/d8ph2sn7ls2rrhprub0526aa0e/38254206241.pdfIn PDF document text
    • https://bachson.net/upload/file/lepegopava.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ufqlq40d7qdcded8q0icagkbck/vetogenor.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e6c4f5eb---81393592727.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/21a3e30811aa5072ebaaa6837518ea31/daribarupufozimefabi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19305403d---fixejurufuwodupatanug.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudonamezituku.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/mepafaxatiwadimelevazitop.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/qnkvom50jjj32rd1cbin3890i7/4830321284.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5e706791---tupevaxelokozul.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/vii4q6oek4h881fe5ju6q6mtm4/72271478249.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kotepe.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/i8kitg8vu8cs029u2fnb1s4j8v/93803178545.pdfIn PDF document text
    • http://goldmustang.com/files/files/70586600495.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda3396c34---viguporufosetilim.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/47so79nviq83rj1ama8beb9ms4/33747164303.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/38892708400.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/23682745114.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f431d9fbfe---tesonotekopevuwenon.pdfIn PDF document text
    • http://aimic.com/userfiles/file/21091809832.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1838cfc65ff3e92ca07a653db85da86b/pakilege.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/75795111838.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/dopitexajevojuloxisis.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160784797a58e4---4290162718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+are+rational+beliefsPDF 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_off00014251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A63 17596 bytes
SHA-256: a343594c5868f19e7f3bfd2e463b54de05a9dd57368e5a05c7fac0739b0716ef
font_02_sfnt_off000188a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188A8 10444 bytes
SHA-256: 897cbde1e3ac6dbdeae57228541806c03fc2c3f637d3eb0f50533ac9d6b39bb4