Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecf7f272ef5e471…

MALICIOUS

PDF

83.7 KB Created: 2021-10-07 16:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 59db748231a4a5863d08b66fc9546349 SHA-1: a8b201470e15faef997e7a09c297cb566c2b7f75 SHA-256: 0ecf7f272ef5e471fe26c1ad1f77a4ca6c7fc7f4f266c67424f5cdbff3c391d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=introductory+biomechanics+from+cells+to+organisms PDF link annotation
    • http://gorod-r.com/userfiles/file/pavofezupun.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/78271845097.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613597ff32dc3---girabutusuxajalasiromuwen.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/47827653349.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/vajetixorikejogamo.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/womefigudipaguminetuxow.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/40418671754.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1c75f91ac27b08ea2f1fa734cec3ebe7/56667083395.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161582d5f349fe---wanufurawiwis.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/46108046168.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/47583205821.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a687ul0hv4d7ohs3t9h1bfksnk/21767519495.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/75340883905.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/xiduk.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/tezavo.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/20959579984.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/33397920259.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/josij.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/movarofezeg.pdfIn PDF document text
    • http://autodilygood.cz/files/file/monomugevobot.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/logezi.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/mibutu.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/dofixoxirivaleziv.pdfIn PDF document text
    • 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_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 11228 bytes
SHA-256: f43620196a78e12587eb34fd145535dd22db2e5b14f3d33536164c44fc4bd8c1
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 18592 bytes
SHA-256: 3c2e61ce9fc576b7bea53a979b9d50de033bc2cc7e56b55b217ff220c54dda95

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