Malicious PDF — malware analysis report

Static analysis result for SHA-256 667a60ce99f1a4fd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 04:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a5851ffc692a163b74dafaa168aaaa4 SHA-1: 8f2c4c70063cc4470fd32b0fdc1c7839969d496f SHA-256: 667a60ce99f1a4fdf2490e95996bca6c9194402501f503568fdbd2331957a765
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF's structure and link farm characteristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • 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.
  • 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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b61338f20de---vijudutosenej.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c943a13f306---44125520853.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1611d034d56528---folaxozi.pdfIn PDF document text
    • https://xigmatek.com/upload/files/katej.pdfIn PDF document text
    • http://katachizu.com/img/news/files/xiwinusuz.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/kaxunidikanikabitajepitox.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/65180068849.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n18dlc8odo6qmd0vsmr4s6gt4d/kixomigozezipumidatuvino.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/95659245942.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/kumanusugere.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/sewajiporegexedotugom.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abe083f287a---11626534579.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f247874f3e---60531729407.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/64022877541.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wariwotafumux.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/13277070598.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/70594688298.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/tajutiseg.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5712910f0d.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/xemapewon.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/jarepigumoxojarudiju.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/64121390258.pdfIn PDF document text
    • https://arerp.kr/data/file///18003778988.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/perogatobi.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/64819990773.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/dd02d07c888809d448d8a21ace97ea97/givexusilanibujuxiwugil.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/radazexomuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=el+capitalismo+tardio+pdfPDF 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_off0000b7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 10528 bytes
SHA-256: 238dd2b69772727592fc4a405d39ad1cfac56e42037fbdd8143c2a8cec4e1468
font_02_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 16916 bytes
SHA-256: 5bb50e6f3d7243a1f9db65b0938876bdf348b83b582b993a7f7bf883561cc3c1

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