Malicious PDF — malware analysis report

Static analysis result for SHA-256 766c06c3049e55fc…

MALICIOUS

PDF

100.9 KB Created: 2021-07-21 08:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b5f540fa616890d6844b16bd1774c00 SHA-1: cb5342b83454ef6a73aa1ebff5034e035ab7651e SHA-256: 766c06c3049e55fc841e48efc4fe0a25172a3483377e70b8029cb58297c10dd6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53687c5832---59420724797.pdf In PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d363c1ae4ed535585d73017a6f1bd51f/fozukaxirikujus.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ctauuc1u882f5v5ehc6fg7qbg2/mutomebinebugojokosukutan.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/wixewefeboxe.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/r70i7k4fivl6f93otj8kd4ksd1/legumotedotirujuz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ccboarnjoec0uaombnq0qt403d/wekisemesitanina.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/tagoko.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/dogafuzosoroxav.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m6b26abtcmppjdgnjngj12vuae/93588700615.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/xukezesapow.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1dbc25f1---93685197532.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ca84164a---wodopazovubi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dff3313213---64831697219.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5955238bf---gomarivukuwegadapeju.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051807075899.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7ef77a6555e6633d33f96398974a8c67/wikubuxobegifikawaweseriz.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/93489862252.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b14f47382---felevugakojajajize.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6df040f0f2ac12dc784ab5886a8e5f11/18446419669.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a610b6990d7---kutekidupojutetologu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f29e935e4---xilivetameroxepegarum.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4f42fcc8e2---97874860650.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5941e1ecd---23243252954.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/05b5d739bfb50c65d960a532b4189a18/17052357475.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/gelirogusur.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/jototosuwutimonigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=reasonable+restrictions+on+freedom+of+pressPDF 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_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 10968 bytes
SHA-256: b12e00952c976a6020b17310e638011d9db62074b67a18adceb95b7901030875
font_01_sfnt_off00013e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001565a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565A 18188 bytes
SHA-256: 8d9e62aa6652119d51979b07d9cb6e37f2de1f3821b60c7e95c1d19dbc418401

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