Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d19bcb19c61582…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 07:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6b0e739f6809ca142710eaf1ea8f238 SHA-1: ebddfffce2a30f0ac2695cd8f8049c607d59dacc SHA-256: 65d19bcb19c615827c3361a7019f4958049258c92ce03b75182ffb30d869310b
156 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 high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The presence of numerous links on disposable hosting and the use of UTM parameters indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/r65sk58j6acgl69vsr684fud1l/jiberivudibekusu.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdd5781a3b---427394911.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/rifogolit.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/59542347831.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/kabjiurg3f7e4vdq5al9sfa07l/wuxawe.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/32348125002.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ece5caec---nutafope.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/xarisis.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/peasfe08r1ep71n32asims9et1/92369568862.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/zamuberozo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16117ca2fa8839---47115731654.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a01c1929bcd---fajoxis.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/zukabizoxujurumotatasalaf.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/napubexesamituvakipafo.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/26780767286.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/13758261523.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/nopakawa.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/butuxuxipexelimixumuf.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/76987891167.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607184852e31f---xewikilegenodonosud.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/82076747033.pdfIn PDF document text
    • https://nada70.org/userfiles/file/17955062356.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/21174100887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2000+pontiac+grand+am+owners+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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 18916 bytes
SHA-256: dd9d5a0053129ef888c3a53061e0fd29de29ea606b7c81e94d3ba8522865bd9f
font_01_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 11188 bytes
SHA-256: 4e4305290091798a98442dc6f3a4893b8285b4c81cd73d122988117037521734
font_02_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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