Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea74a3d5ef25348…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 02:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17b65d4d7e1785db70e08b8823b0bd47 SHA-1: 1e79347d0491fbc45117812d26575444ee8799f5 SHA-256: eea74a3d5ef2534849736ccf66200e21296267fc14362b78a48727b74fa5cc58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These links likely lead to the download of further malicious content, such as executables or additional malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=reinstall+uninstalled+app+android PDF link annotation
    • https://sluganarodu.org/userfiles/files/mawaxes.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/leninileximanufavumuzeke.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0d04cbf1---29446031801.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/fisisesibuni.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/19389748623.pdfIn PDF document text
    • http://swhos.com/upload/files/xemupivosolefux.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xutezum.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/94350701071.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/14424724290.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/34767232695.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/49757409800.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/30853238504.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/23827236565.pdfIn PDF document text
    • http://yepuco.com/uploads/files/28385134523.pdfIn PDF document text
    • http://taxfreepoint.com/file/lejavedetavonuwuz.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pm1uleoie0luolbig2tmfbqku0/devizeredewigubopajepofi.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/30580143029.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/sogunaleferivikuziv.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/12782834208.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/32191748484.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/mobagimak.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/pupazabove.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353fdb4ad0b---xadakazozamataxolumu.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/72343838469.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/daweluwogigifa.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/22901893828.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_off0000bcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBB 10528 bytes
SHA-256: 8b54324659a8b929e4e7843216c28397091e3fd73a7b87e39298e2a2386073ac
font_01_sfnt_off0000d4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 15960 bytes
SHA-256: 279e705c5440a9f092222afd55bc78d1dbf4e3aff67315247fcf8ffe7298ce8c

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