Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda31333fe8e4b98…

MALICIOUS

PDF

103.5 KB Created: 2021-09-04 11:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 821fa6e90927e39a2bf1333350a2efbe SHA-1: 374d1123328bd4e20c4bd4d14da0116d036a2aea SHA-256: cda31333fe8e4b98b8611fc5e66322bcfb950b96157f0c769ac7e63c9b1376f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the 'link farm' heuristics suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=railway+reservation+slip+pdf PDF link annotation
    • https://blsautomation.com/ckfinder/userfiles/files/51759258875.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1c9ace426d340336d4a70ede11e00939/tofijojubaziwifevibudip.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p50olrdjs8ktaie8mu1n96tim1/81943216591.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/gabonaduvozuxuzaxa.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/35305191040.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dffba8a1a---33860954395.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/xivutuvekezo.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/ludigaresipopa.pdfIn PDF document text
    • http://coumert.com/images/file/gimadepinesutigupibeb.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/80426ac946b9b74b9f7ad0de01a4ea3c/mopozifenenisuwadure.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/2559541.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/vegiwugene.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc6024972a---69833510698.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tufepaf.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ostc4rrp65gtksmfll354c28u7/jesumozekugokulov.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c14b7cdcc8728075c64c982d439a8761/xunitatolakoxemipo.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/dusozozufuxabuzomutale.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/83189512697.pdfIn PDF document text
    • https://upaspor.com/resimler/files/mugamodit.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a54554ad3e---35042946913.pdfIn PDF document text
    • https://invest.pl/userfiles/file/34967320057.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/27e694bd8f5f3c0dc368606104ab7e92/buzesovagetudibamabux.pdfIn PDF document text
    • http://metallpress.ru/files/peposodaterivifofofijesok.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f707c8132e1---xegogukozem.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/mokosiwezo.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_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 17976 bytes
SHA-256: 344ff79e7653360e1b9881834ceff1308ff883c70705c24f918e5551dbaa628f
font_01_sfnt_off00015f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17726 10804 bytes
SHA-256: d64e9f0d3cc5ab1b4143a8e852007efd04ef9483b562bc7910a636ff224bf168

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