Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7000a156079ba87…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 03:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71091ca81ce1eececc70af72a64d0a57 SHA-1: c7318b9c0e88d3b4abb869547d274d88ce907928 SHA-256: b7000a156079ba87cb07795455ab37a87bf754c704c17e1758282ae08ea4f007
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains a link farm pointing to various domains, some of which appear to be compromised CMS upload directories. The presence of a 'download button' lure suggests an attempt to trick the user into downloading a secondary payload. No scripts were extracted, but the overall structure and URL findings point towards a phishing or malware distribution scheme.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yournamebadges.com/withyourdog/cms_uploads/file/buwibuvowoxejodumuxux.pdf In PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/97804558382.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107268e47f11---lagekuxulenore.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210825_3AFC5CE0D6CC1AE3.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/91180505629.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/71051669402.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/aaba7c58613656cccb5d4a84953e20a6/najalo.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/vetan.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/58142714493.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6a150fed665441968d9934e0bf6da703/degiziguvizumotinesu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8f928002c02f1e8f89b73ae47725abf6/sujutuzafekonase.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/72002021695.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/koxit.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/telimuvakusov.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/sumulolus.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/43874806900.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/72023466975.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/89632365424.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/64620125558.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/78992632889.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/4837407030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hand+brush+lettering+worksheetsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/198a0cb2de5ca73e07cad317d7d7a0a5/tikukuw.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_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 10936 bytes
SHA-256: 83cceec799addb22da093b18a62c34808f5d34bd3b3e8ecb33828fe2eab7039a
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 18044 bytes
SHA-256: 560648c06363731391e88487356552bd723b97cd175f3f0ada09728d671f1713
font_02_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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