Malicious PDF — malware analysis report

Static analysis result for SHA-256 9583b07f0de27a95…

MALICIOUS

PDF

159.5 KB Created: 2021-08-17 00:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: daf06ae9da72e895e33fba874c3f00c4 SHA-1: e54a911aa1be8088acabe97210e38bc7142578aa SHA-256: 9583b07f0de27a950f71f2862955a3f0d88d3d09992b105b71341ff265fc486d
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious links. The file functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The presence of external URIs and the nature of the links suggest an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=bagrut+plus+module+c+answers+quizlet PDF link annotation
    • http://uitvaartverzorgingsindex.nl/images/uploads/48371376086.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ce3f4f0aa2d6d5768c99535e31e3147d/96478671134.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610841194e934---36887759928.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/83555753080.pdfIn PDF document text
    • http://jdjfjx.com/images/upload/File/sawiroz.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/batubekewasokip.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/vuvureridovapule.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f2c87d1fa---zorovuzavuvowaji.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8kt7gkan4n13sj7l2up746evc8/gubevoporapuw.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/76122423950.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/92416447397.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a388f3ec8bd---zebojojelirejijuzi.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/36948028603.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gazemibal.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/39760353787.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870166c9644---jozirefozubebolixijo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b50d50b38c3c51cd616a6acc7e478e94/71105898296.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/xufupe.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/68772336905.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210714044453.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0f5be10a954bdc94bb45b3ce45ab1e48/tijesoxalosuvafefofa.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/41320868450.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cad0130b0d79cf800bf4e8913643276f/10840609324.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/xorasuwuk.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/xalibaxejukik.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/novexoraxefukemomovu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d178677f6---61146567046.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_off0002058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2058C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DA3 11300 bytes
SHA-256: ac3d636fed6f6511ef82775f6833d2edcbb7e816320d4c5c1a7e696f6e7552c8
font_02_sfnt_off000237c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x237C7 20620 bytes
SHA-256: 843c3186a9f14fd7b0eb3d9c39da08cb9d8b404148c8f92312c847e5570b9b40