Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f75d978ac58ce9d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 15:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77efd9c24405f381a58172b49e0b49c5 SHA-1: 9e26fb627b5c4765e26f087c73bcc4b1b7fc0599 SHA-256: 7f75d978ac58ce9d3b9600681be7a4f2fa1fbcc5854a4e58253c914aa60e8bfb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it's designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple link farms and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=already+yet+just+exercises+pdf PDF link annotation
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d81376a016---kibojabesogoroba.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/28186096856.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/25243327561.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/42202966209.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/12999840174.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/18342332051.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/4967158978.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/31362018365.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/80357746886.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/32691098953.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/30396986417.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2cf92f713fe87bc16d71d8618cc8c752/14540591559.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/tapufigewiwejadanexadof.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/waxetefibiro.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/49257144698.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/pimupobematuzawerox.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/30310292687.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ae6172c2---30264959705.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/37288134204.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2098b44f0---88658505390.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/13195817343.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/be1c53a3dffa2f00b981488fa193725d/sogoxisetolu.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/vanip.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_off0000b9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B6 10816 bytes
SHA-256: d85f90d15e945d08df4a696e2da6db726bdcfb5e3986820e33f273b44c2a7381
font_01_sfnt_off0000d2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C8 16336 bytes
SHA-256: 6689cc0e53b896c7b6b9ca51b8ed9fc3f4ba6e3f4bf2d49b66365a60ad65a7f3
font_02_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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