Malicious PDF — malware analysis report

Static analysis result for SHA-256 e762bfef2b6975f8…

MALICIOUS

PDF

76.5 KB Created: 2021-09-26 07:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 973651a20cacd920322cea1400fc17dc SHA-1: 3e93cea4f0676434f404054bfe84b095c156379a SHA-256: e762bfef2b6975f86cc489ef3f7786cf04ba4118f7f0c67130d308b43027b14d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://boucherienabli.com/uploads/FCK_files/file/ziporoliduvabuxe.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/gexarilelesebijetib.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/67429191059.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/lugiluximegesomunalumevi.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109061150402429.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/bodumixufotube.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/27482593401.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f2c243ed---55497736966.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466bfde73d2---sojilike.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/rotut.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/17938106037.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/faritirepotejan.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/33722343457.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/38407837886.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2d0c20813---vulajexigopasoxafosekov.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/nezug.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/91035777884.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448f2bc05d3---24994158040.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210918_CC75E9574277ED36.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/151413306793.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/76286664469.pdfIn PDF document text
    • https://akvaguru.hu/user/file/tigisuzobisuvir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dekha+hai+pehli+baar+mp3+song+download+mp4PDF 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_off0000bb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB25 11308 bytes
SHA-256: 993e5865912cbadeda31fdec72cca5ff269812388898f8ea7f1e352b588da3b6
font_01_sfnt_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 20544 bytes
SHA-256: d363c0fe07f353fa0523a618e22b2b6da7f3fedb51691bf80dd9ea31f4cbcf79
font_02_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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