Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db4eccc59f05f30…

MALICIOUS

PDF

93.7 KB Created: 2021-07-06 21:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45a3eae2ebdb854145e8d3124d1e06e9 SHA-1: 67b56451e543fe1fe7c946acd60097c5a041c18e SHA-256: 6db4eccc59f05f30d3698b73cc7c47152b1f13b07e30402bc299367eaa57c660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://wastran.ru/uplcv?utm_term=what+is+absolute+temperature PDF link annotation
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a160bcb7d3d---16822280798.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/59c070227499bca5c8ac87b373c84b6b/40992130594.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de1a7b83132---kuwibazana.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/94411536086.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j6v5a6jsen3hjvrus3smjqv4i4/29933819005.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/84725968600.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9ff10927b---81815518317.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/fonibalam.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/21528261898.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3d6804ecaa82f89a724e2082354a5662/8703321798.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0cb44d33094213df1bd907d4ef970261/futapufasejuvoguxurujifi.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/wipefusasopab.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/xozogezelulizoxatu.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/bexajakenaleveka.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc45fe7e16---vivora.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ba1cdf2d---93805481459.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2ba80fef08ed0cbe88b4aa137f8b4be1/78778801258.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/56m9k07utvc0paskhe9g1m7nk1/dodurivogawivowux.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c33b4e660dbd1e300e866e2b69c31c45/jiminitojaxexegofixabekoj.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/13233709936.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503115919603640.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/8b1d34c5151f45497c1d4d051694056d/ratomisirasesebobovuditer.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/dac3aad21d42622b38c334cf398612ea/negasovule.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d48f89a078---dafuturoduxamupu.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/14524168091.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/11576296558.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_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 16716 bytes
SHA-256: fb6432cbb8cf4ac3d6ed37fdf55b460b65909826ca78f323c798da4cd6de0718
font_01_sfnt_off00013927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 10648 bytes
SHA-256: cf50cc6bbf73ec0fbe788812b5b75ca307d5506a332bcc60d483957c3d580cfa
font_02_sfnt_off00015153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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