Malicious PDF — malware analysis report

Static analysis result for SHA-256 1404165640e03e83…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 23:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d5faacf519a06309c04cb6abfe563c2 SHA-1: de567f6b04e740acef3b27b79c347b43ba393184 SHA-256: 1404165640e03e83de09e8d2d7e59d6a646263963f3fe5c9c1012b4516e2e3de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The presence of multiple links pointing to compromised WordPress uploads and disposable hosting suggests a link farm designed to obscure the ultimate destination. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/48307756860.pdf In PDF document text
    • https://pabxlg.com/userfiles/file/xevumizadebaju.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a62b00d0f---95078462986.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085758beb063---57454736340.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1b9d9c38c3c3df19d487385a0761fb0a/44173837887.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/pananogowipeb.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/22166770066.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/89878476682.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/88209065848.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/zixujapexoditiduzawazerab.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609363ce8e2dc---savowevogakife.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/91612227976.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/e55e4126a2b58a6e11fea1dc39e031bc/48685584391.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad01be86e2e---xubinidavu.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/bobogumalolop.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/9823797565.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/16124304679.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/chlkdlsphd2i7sfhi4p8hrrgn3/58438119327.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/dilofemuxifivazugul.pdfIn PDF document text
    • https://flyags.com/editorResources/file///49450468232.pdfIn PDF document text
    • https://superpart.com/files/41517294015.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/najulona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=incremental+change+definition+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_off0000b54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 15140 bytes
SHA-256: 0d495708eb4279b989233db4d19f98d72e2790b1b032499f4f42e7c437a45cf3
font_01_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 10852 bytes
SHA-256: 62f9a59ab2cd747164d2f1d8bbb9c1b6783d68a39e2cd2d120117f407226ed73
font_02_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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