Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7f50c9596cb7f9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 00:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ffec6a19ee8f2c87b09f2cf1ae965fa SHA-1: 005ddf1003cd60532a9e8e122a5727bababe32cd SHA-256: 2f7f50c9596cb7f99a7c78d67b3e94f1d89c9dd08a2c9481f47658b9c8944976
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://rugsinc.in/UserFiles/files/64501802763.pdf In PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/27840303622.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470a2d7ab47---21938299030.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/53366474989.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/loligabinitatawemafubuveb.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/vexugufewufojelotuwovodox.pdfIn PDF document text
    • https://palet-school.com/files/files/96841139611.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/voligebogalixuferef.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/zerelapofigiroluletodil.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/jupalozusifisi.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/2860347233.pdfIn PDF document text
    • http://airfa.it/userfiles/file/62103721932.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/67713069398.pdfIn PDF document text
    • https://zhansq.cn/upload/file/tojatuduwepidurimexegari.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/79790859296.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/66234126651.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b9542ca098ceabb25bc515e0f6713b99/66542661595.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137170213297---80396312859.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/zedekosenutegagalinobizu.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/44710417760.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139870bf24d7---jupumevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hill+climb+hack+game+downloadPDF 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_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 10760 bytes
SHA-256: 2a19d4718339318cc3dc8adbcf3e8b91babee3d3f2e22cc781de3bf961b163e7
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 22664 bytes
SHA-256: 307e2c036fd77592896fa548d1eb21af8006b3a4df7613a39763bfc9ee4a088d