Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa2ac59fb1cb98d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 00:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9ea04a7b27f8d7ad1a3921ee7f43042 SHA-1: 6610cfb74aa796a419969d3942e1127553b9debb SHA-256: 9fa2ac59fb1cb98d7d2d365898ce9691b77bedd67155b219df9a5e723c22fb58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=mapeando+con+luz+maria+ibarra+pdf PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3733e4575581966dbd73d7c2cbead3f5/zopepoxadobowowunovej.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/xitavajojujagu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6deaeca2---39026578056.pdfIn PDF document text
    • http://irths.com/upload_files/files/16963866262.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/xemifu.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/57758277446.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/96026962256.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/mubukutigiwiwefufozefij.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/93f55c4be9eb1515f1b23b24cb4e5fc5/wekudebaxoso.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c55a5bca1---78953804399.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/fosurorog.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/zupidubulutuz.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/32361567630.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c931a213---28858213388.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/941bb4f9a4723b273c09f3c848862686/muxose.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/penosi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2k30mg2gtk3gpa3kcac9i29n0c/55177383171.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/77fee9f334a557d739f750c130eab54d/pemamifajepagubefivojex.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/47151460168.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/42a201d2a31b7eb950385af40083ed42/39135261479.pdfIn PDF document text
    • http://kaies.cn/upfiles/210524141127956482tyyloj.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/76238855215.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/49c13cbd9314c3906318a16acf86479c/15798916718.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/suzuzazitomumako.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_off0000c951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC951 10808 bytes
SHA-256: ff197ace96d3771ccd6878418043a74c08ff2ddae89a04f34abaff3b0664c695
font_01_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 19548 bytes
SHA-256: fe0433533709d8e09e7e25d9ce9d0d753c5ad70ac7108f18967edd6672dc401c