Malicious PDF — malware analysis report

Static analysis result for SHA-256 2539c1e0b985b3a8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 13:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b59929450f8ce18862075f3a5b21d7f SHA-1: 69077deebccc6ce602ce38a14f4ebf64bc4b9abc SHA-256: 2539c1e0b985b3a8151503fb8d7ca7a23dcdadd3211d059439e45eb887cf0c6d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://oniceh.ru/uplcv?utm_term=peter+rabbit+full+movie+tamil+isaimini PDF link annotation
    • http://aktifbant.com/resimler/files/zutuparikasewetelulisodu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rodixuvukabamuxo.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/kesawexujutipafawaluga.pdfIn PDF document text
    • http://palami.by/images/file/81534258374.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bc225f21a---60389257929.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130581d85291---42636821086.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/bivujizasobinobodir.pdfIn PDF document text
    • http://potlista.com/file/files/17789811687.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/88338086067.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/nebazodazazafolosukof.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/10473954258.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/73694165594.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/66533100171.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082eb705ed---15730723841.pdfIn PDF document text
    • http://telektrans.hu/editor_up/74019234173.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/52076668309.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/zamudeguxudigo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bf6e247caed3c97b66170f51cd1611f7/vigoga.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/wofozusos.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7140ae7d7811b5154d08c352d283249b/jisazogi.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/89825185738.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/dudibodutaxilezodosabivu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xosivi.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/90270845330.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/85276313192.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/juxapinelojipopubusonaded.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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 10680 bytes
SHA-256: f36a873876657e12fcd985ee5c3d952fbe3462275f35337905e350c3baad2178
font_01_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 18644 bytes
SHA-256: d3bea122872716670de700aa1e7d37699b0b4624085f0f9b582d140fc8f3f7fc
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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