Malicious PDF — malware analysis report

Static analysis result for SHA-256 4793cee1b4097536…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 17:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a37ecb812be465edd7355cabbad75aa7 SHA-1: 6cb6397cd2e9b57168a20710811c55c70f30982a SHA-256: 4793cee1b4097536bba9764660e7d6d025144e4e5205d21afc708bae7db82229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains. This pattern is commonly used to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/v60r2kte9809niboqjnd3utf26/80542128711.pdf In PDF document text
    • http://bctlorraine.org/userfiles/file/bowakawodokejewubaroreper.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/jidabametofixob.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ea7fc714f598a3f3c3f77428298fa8f3/subufuvokizugevoref.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/suboxigapupobo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f6e9d24ff3968a06fb720c6512cd80c3/55677836887.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160937f562c924---xexusivafexalexilaf.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/65364849838.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/42479102252.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/41706f3c721d8683be9b56e84cda9db2/devinuzodidepe.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/40094616866.pdfIn PDF document text
    • http://eternoohydro.com/d/files/savulijudimivabadasojopuw.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb8a05e07---14848578483.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/5273498089.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/55048012924.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/bedilukek.pdfIn PDF document text
    • http://donghotam.com/luutru/files/retobametujopokibar.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/xiwegoxapuberutirisik.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c4526dd1edaf8a713e09661a522f136f/57854509345.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/kixavavezomina.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/xobufomosasaxofefiker.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/97388058414.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/13599847471.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b68783125---vokupesexewiraw.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/9v56acrljtcrktebif2o5nhcn8/21689221693.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3fd5df158---10005541870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=harga+isuzu+mux+4x4+manualPDF 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_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10432 bytes
SHA-256: 7b94641c684a7a52707fc8fe0abe7caf83e335ec0414bd17c4f3b025d716bd96
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 17076 bytes
SHA-256: 9e4c5376618f8777ed8aa5b449395a2da23a0fefd83e1f38bafbdd31ae737eaa