Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c3fdc3a98a9e5a…

MALICIOUS

PDF

117.7 KB Created: 2021-08-06 16:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c54f4f6c172e85ae02c8d31e3c3c1e3 SHA-1: 3c55614232128efd60223d2434a8332325eb8a6a SHA-256: 75c3fdc3a98a9e5a5765b9953eb2be906ae5d133442df018d895384582ba6091
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update. The embedded URLs and the ML classifier strongly indicate malicious intent, likely to facilitate further compromise or credential theft. Although no scripts were directly extracted, the nature of the lure and the presence of external links suggest it may lead to the download and execution of a second-stage payload, potentially involving JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://smidgel.ru/uplcv?utm_term=papa%27s+wingeria+hd+mod+apk+download PDF link annotation
    • http://fmi.lu/userfiles/files/3788250121.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/letimov.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7171b1cf4bbfdba40bdf07a296a21386/zupatinozisepinoba.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e57c47926969ec5d1bddc79a55301ae3/84806911390.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4906c6c6---88800856632.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rd4qc1ku1o7tf2boc0nk3ukm3l/fudakem.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/924c8e4b89f7e565fcb5ba2146de25c1/kagosososaw.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/14010066473.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f2fff06e8a4f4099fe186d59e6956ccc/xebobaduxevedunozawofeko.pdfIn PDF document text
    • https://rm-parketi.si/uploads/tijelinevukinojexerugus.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a2cfd1acf2c96b9a23f8d9455165ef51/fanifeluxibepifowur.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jesarafufagibab.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/1223311213.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/magifesafazuzife.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/natigikeneziwurawidati.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9f3e90b2---lamokovexofemuj.pdfIn PDF document text
    • http://aurora-c.jp/files/files/tixut.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0de1c0e7c---56716699962.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/999f5ea869a4d14c388fea0674888e61/pukupulubolopuvedekosu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b80d0278ce7cdd31b8b65cc2cbc7ede6/39933803318.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/vezexuf.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a189bf080569a503401a27b30be548a7/jawovo.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/86209918626.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/14853524258.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/xiriwiwesidewi.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/timadutofekinikorogetib.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B54 19888 bytes
SHA-256: bacac089a51cf986f957093b2caec2026d2518523445f6a287a615e8ffc03821
font_01_sfnt_off00018e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E57 10952 bytes
SHA-256: c9aabe9dac1f492b1c7bc16aa431a08e3075a5016e09023d3eeb91fceba37988
font_02_sfnt_off0001a764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001bf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF71 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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