Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3949e28fa24306…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 18:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0308e6cf4f238551369f9e8a9d6b45d5 SHA-1: 78d1f7b7b5938baa02576a97272b7744aba9d3de SHA-256: ce3949e28fa243062931637821fb6ed41b404650313c93a97718d43f69cf3666
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a password-protected archive lure. It contains numerous links to external PDF files hosted on various domains, suggesting it is part of a link farm designed to obscure the ultimate destination of the malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly indicates the document's intent to trick users into opening a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://reutlinger.pl/userfiles/file/keroj.pdf In PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/95699434004.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/86111216884.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/wufum.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614264791a65c---4981755991.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109061821101070.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/3560882895.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/30260618340.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/1943428258.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/43429688077.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434d453d1d0---gidileluranugoziduvif.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kowatalu.pdfIn PDF document text
    • http://theponghop.com/upload/files/gutef.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/38353196869.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/ribela.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/pazifizerujodikuge.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/tujikimixosexogoki.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/42902517057.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/1858048163.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/71987957037.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/vapurazaralunapejakinusa.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pknb1strlcfu974qakkiqev840/80877676084.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/febetugifeludibipewip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=limited+connection+wifi+androidPDF 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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 19664 bytes
SHA-256: b98836e80dee5c6c1b1fbdbbd64cebfcf086c8b25887600768bed78652c8ce2d
font_01_sfnt_off00011689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA0 10464 bytes
SHA-256: b930e760cf06cd8c8fcfb017ff10594965da0d678b68dce12608603d74823f2e

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