Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d82b40652b0f8a6…

MALICIOUS

PDF

85.2 KB Created: 2021-07-28 02:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3435886cfda47ae85ed263f0eb3ffabd SHA-1: 961cd946bbee7b4bb7ac43158b78897b4c0d9ee3 SHA-256: 7d82b40652b0f8a61afbd156dc4826c1d3d15069462c83199d74dacbdc278c4b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or exploits, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f09669330---74581960449.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d450ecae7dc79f32773561c6011fec84/16844515296.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210704_084352.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160866559cb384---93924142101.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/fiwetuguris.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4b96289542a1d4fc9952eb9ad51fedf9/21409886020.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef2dad3d77---fodarujoxewulipijinagebo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3636f6f0---xubefetuzutapo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c9a52daf1---mawuwexapiwunivolumiv.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/dopuleg.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/14348175205.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/lidob.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964257a9191---xaginalunozadamalo.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/bumumod.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/40540110103.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/97438797828.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b78e7f6ee---sotoweboforigelazuwixuram.pdfIn PDF document text
    • http://paliukenas.lt/i/File/41275890941.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/38666519119.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/907396344.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ea375f0c---45827647873.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/41885992727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=regular+verbs+ed+ending+pronunciation+exercises+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_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 11248 bytes
SHA-256: 5e08cbb2d1cb74015c566d4175ff1cfdda14657ee23940acb3d3eb482dd717e0
font_01_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 17512 bytes
SHA-256: e0f4e05451dbb4f88cbc197456efb8add84efd06a2e70460c7a9e32cefae3ca1

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