Malicious PDF — malware analysis report

Static analysis result for SHA-256 e691340f964442a3…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 01:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1161533290e4c65eacab2113b2e5730a SHA-1: 79a8a0ac434e5375aa8ae48cab01119a145fbb98 SHA-256: e691340f964442a32dada6fa6d403757bb6c4287a81600bd781ad74295c3409f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable or compromised hosting domains. These links appear to form a link farm designed to redirect users to malicious content, likely a phishing page or a downloader for further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=start+where+you+are+meera+lee+patel+pdf PDF link annotation
    • https://aprilboya.com/userfiles/file/jutap.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/zezilizazewewowazawi.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/zetukevurisinuvesizase.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/87581687331.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/puguriramofijezowigefi.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210902043402.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/63152793401.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614a369170b56---4054062507.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/42291176171.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/gifixavodamiwolixat.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/65085427672.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9a961843560d5c432f31d044e4c73324/34122820601.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nevumivunorep.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/moguvoxavovigibe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c6d30b3bf---39883273192.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909051751.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/xavikaguzovaman.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/7243848945.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/93971321123.pdfIn PDF document text
    • https://eternalbliss.net/file/80391159046.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/zurozebazepotuzakopuw.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/modatalu.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/82995480149.pdfIn PDF document text
    • https://langumeistras.lt/i/File/18832255035.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_off0000b9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 10772 bytes
SHA-256: 2e96e3277b5e8e90e0fe2e55a0c88de2d903d581d9c7818f34ca5985a7598a75
font_02_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 15972 bytes
SHA-256: 99b24c91bbdd8777c6d8dbfe1badd56feb30cafebddf99ebdeed5b13e67bab52