Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33485d82e6b8f9a…

MALICIOUS

PDF

98.0 KB Created: 2021-08-16 03:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8a6fb4cc3ac1d2c0bbf657e96810482 SHA-1: 8805e376162550bd6e3aa44b44721ea734367b35 SHA-256: d33485d82e6b8f9a23d4da8d6497b9b43f92dbd899160d036dfa67b5eb35529f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution document. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://nic-n-nate.com/files/files/52465123701.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16092af8de9578---wezotufevokerinep.pdfIn PDF document text
    • http://gerocuki.hu/user/file/fiweral.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa14a38b6---bosuzelab.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976de0bb854---47577420800.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/364116dba92cf0c79d3dab058bb00847/sataxiti.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609453128377f---xagokukobokuji.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/mimixoriwamigodafe.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160957cdd73b78---5294969129.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/80999447207.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b76f79507777698a985fe7390ab9a4ff/5031570217.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rigatinotede.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/zategonasaluzogevalemagi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/62472185700.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/18d90444778410da855c219017fd6ecf/navezavopomut.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f25e077ea0---22715677795.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/53443071874.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5a1093f05---51389623937.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/74404933.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/53701528924.pdfIn PDF document text
    • https://emprenderem.cl/files/sejojuruvixubasusituf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c24ad92f4---jugub.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/dasitanemifewosaza.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609022f5c525e---21770979345.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8d1bb875---jegunerirurupifovariziwap.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3862f05761---54260691583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+turn+on+nespresso+vertuoline+machinePDF 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_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 17548 bytes
SHA-256: 50d4111875c4b0a56beb92de744ad0df77b94a6efed0207ec4156258ae5497b8
font_01_sfnt_off0001485c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16073 10880 bytes
SHA-256: 0016ce7f7eff22be8256d7db02090c4741a9eab937c74f364c143d48c9b71ee2

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