Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4ba8caf05c6fe5…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 21:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2a7de6a758659943900274c4cd221e2e SHA-1: 564cddbe2a665cefc90db077ec6529910214a5ab SHA-256: 5d4ba8caf05c6fe53c32504d5784657043975ee033f5668ab53338bcc5b85352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://allytemp.ru/uplcv?utm_term=custom+rom+corvus PDF link annotation
    • http://avsa.org/sites/default/files/images/files/2505331724.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/12032058429.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/86802695246.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/tukoke.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/tezaduduxonamojuwemuvegad.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d264c64205f71c5646243ebc18876ff5/12767685680.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/zifetosefojirewimu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab7002475---gozinevuzevejexowotare.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce1200dac---jazuleta.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909223218.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/22957866113.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/63106761225.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jesabolota.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8f805e2dbc673e181bfd73143a41188e/tivudexiguderorovip.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/11232261849.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/dalilujosawem.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/fupobemamakoxuxebezemuvu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9d3ddc4921a40761e5c5af992db38cc0/fezeguximamopiguwixibo.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/95758162346.pdfIn PDF document text
    • http://93564497.com/userfiles/mizufomokofegemevipopasi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/123af5554ce2557589a637004a174982/69832401685.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210911_022424.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/15688481074.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210913022856.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/vunuluzojusovon.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/3968232794.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613387869b414---wimemixobeb.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_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 17412 bytes
SHA-256: 502863fde8c6bea9a38a5b0ef6b7d9ce5c3b8a09f8688a0b87729f05c266749a
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 10052 bytes
SHA-256: 5ff23cc692ef8b82e55ee9c3523161c38218b92164fbad3b4ff70ed25dad4300
font_02_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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