Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b6c13793ac3a0b…

MALICIOUS

PDF

62.3 KB Created: 2021-09-19 12:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e88494f17c3edd6ff6c32541f222ebf SHA-1: a47ac0c4278d8852800c692a73b12816708adcda SHA-256: 86b6c13793ac3a0b17fd35c5e980097cb9abcf1156d8d97ef804baf1b665ea41
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=dolphin+browser+for+chromebook PDF link annotation
    • https://elegune.net/files/galeria/files/vatifefinabunawawagosa.pdfIn PDF document text
    • https://jin-ji.com/upload/files/zomibasupob.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/897c2924fe7d0870f7fa823459532ef9/xobidurapesoto.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/nolutenaxujilod.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/tetuveruwiboluzinaragid.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/jeruneziviradunu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/79922963021.pdfIn PDF document text
    • http://africareview.in/userfiles/file/xapadegalusepekejuwo.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/19816690749.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/zurufanubupi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/jn5la2nv6kguf8gmei0jk76phuauoef2/tawafobum.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/31269571335.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/bixipiwejidozusi.pdfIn PDF document text
    • http://acelybio.com/upload/files/12284120124.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d142b9bb8ef5ff9b73f4a3c791b72d98/73331338926.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/64756449388.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/dokefaxuwamugowitiniduf.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/22067959408.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/55723571204.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/zumup.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/fuxemivetuvij.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/31881732367.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/midefozaluw.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/95581428506.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8335ee6f68a130ba6b04b4568950190e/tomibuzirigorokuj.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 15732 bytes
SHA-256: 1df82d7c370dc1cb89fc35dc3188576441ef002ca18d352cddc33bbda6e89a58