Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6dbac0b6c03b08…

MALICIOUS

PDF

82.5 KB Created: 2021-08-14 10:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d5036a1444ad82d399965d03e0b5ec2 SHA-1: bfeee24b53cb1fcfa31e7d0f23ad386b633e49bf SHA-256: ed6dbac0b6c03b08bcebafaee6cbdc56613b9ede31330fd7fe728bb9e3b6c9f4
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of a 'download button' lure reinforces the phishing and download distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=muse+dash+mod+apk+data PDF link annotation
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a61cade465331a256ca15b5217a0b77e/29010232595.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160795aed7f272---bowedafegeve.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609576e3483a0---53098691070.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/11383444599.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/30612c5md3tkvptdikd1hu6ft0/semanexufukajot.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/91538958162.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2a3292adb9745b5e83123a28fb907f79/56407291739.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/081656eb63cce00a44f5b4f162336afe/96457833379.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/4975711673.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/hnf958jfl7qh5b1tq5jhb7l9t0/8016591055.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/timesasapomibipusuvab.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609858025897c---rovibufaxagobazesejo.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/lakogerilabiv.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/sipakepiponelutaronagog.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/93247657924.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/rawulobadujuwawedox.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098833a8ec46---22472813907.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/50184898739.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/53595d61419f938f071a86bb4451e11b/40554430432.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3ghono7c2pcdbmt0hfg98j00kc/57065909958.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ee0a6e42---tojonurutasunexixadal.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/7861488158.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/60089312639.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8adb6d41f---26881322267.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c28844c2c38---95436669200.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/99764488562.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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 10500 bytes
SHA-256: b794f8c59b290c08966898df74b1113d18696843d34add8b9c7a9d7177bf2cb0
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 17304 bytes
SHA-256: 592e2ad31deb91afdc315f25dd61c9bdeb3c5751ca4e0b3554a8b8bdc03cb445
font_02_sfnt_off00012288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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