Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1b57a1dacaeb51…

MALICIOUS

PDF

86.3 KB Created: 2021-08-14 02:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 513654b4ecadc10a97db6bd43fd89778 SHA-1: 3f5631ec6a52e46f2c259c28abbd803b5614a401 SHA-256: 1b1b57a1dacaeb51fd280b55415e6f216f38b76ffa1db2acf60a804ab95da286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=brocade+network+advisor+14.4+installation+guide PDF link annotation
    • http://starwindows.ie/ckfinder/userfiles/files/mitovakaleramuv.pdfIn PDF document text
    • http://heureka-cz.eu/files/nudezasudijufevapeji.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee69058792---duvowomoma.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/53056525605.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096de66990eb---41820722329.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/86450349148.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/nisidikevatoribaro.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e948c516ad---fejovarijipolof.pdfIn PDF document text
    • https://epiphanych.com/images/file/14655917199.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ecb401dd2af50f5b06c100f97ee6fc04/50407409979.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/94454515034.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/43943820669.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b464599764---80896217496.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106a4ec9a7cd---zubemejiji.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/45497982487.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/kanowidabugon.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/ledero.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/450926e677062f5efec5c90a6249a540/pevadejanovusosevaxat.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/11193959331.pdfIn PDF document text
    • http://c-amc.com/upload/files/36765851261.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/55517867973.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/53593927769.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/60424429600.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevujepezodisokuzuna.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d1ddc0fe37a2c9a318d768362a72069f/jerebokofekup.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608338676e4c4---fonitapuwiz.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_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 16936 bytes
SHA-256: fc4132207ee865adc836707aacdf34e8455aa35690077c66d031f714872c944c
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 11140 bytes
SHA-256: 7694cd669a699419fdc7a617d4759ac94bc5a12de14ae642a57148d342222aaf
font_02_sfnt_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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