Malicious PDF — malware analysis report

Static analysis result for SHA-256 b448de3226c77179…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 09:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3e83b16f57224bc0e10d914c877e997 SHA-1: d503511ec103f559c7d52abc1ffae879679408aa SHA-256: b448de3226c771798a074ea15b105831a6b6734ab6c4b5173716c8e5a9518366
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://3colorjazz.com/fckeditor/userfiles/image/50352105176.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8fv4sg1ccrvvufmn6574jbhkpo/34184829548.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/bixibagimuvikemipile.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/95504307107.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4c227e0ea7c8bebdbda1371c8e9ef5fb/dozuvuzije.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/safek.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/sidupa.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/memalajoz.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b79b7d5608---timixifatazosavazi.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/puxexewunawinovefuxujulij.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/robasivufowifizibuzojid.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/55920256603.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/5078647593.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/xuxipilusananow.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/79832555287.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5000f9fa57---bufinovopuzuwukusu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/69846281622.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/014f8acb7873f13a6e7f45d3e3a8ceca/wupezejawogetetik.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/952cc755c6e952a253df49e94be24799/44130516945.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/subisun.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/posugepuki.pdfIn PDF document text
    • https://electroagro.es/pub/files/warojowudididitijuraxe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda6776622e---kixojaxinawaluzunuwabev.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aef90cc3ce---77643208074.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd157843a3c---siwekiguwota.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/nikexadixex.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/26537421046.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/10e923a34e0bb80aab72f3628f21b017/5421580875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=3+leches+cafePDF 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_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 18448 bytes
SHA-256: f2775ea1e99233564f2baeb03dac851cfa65d74bfb6f078fe0bd06781016f385
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 9996 bytes
SHA-256: 239a9866ee98eeed4e4ab56449b65061d2968d5f5a3d69503fd58c6b9355642c
font_02_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1