Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16fa37ad832d71f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 23:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acf35a3bff19f657a7e9b67f0b7f5186 SHA-1: a1723b141d1b2563c48bc87789872cff4a620e8a SHA-256: b16fa37ad832d71f118245091ba2c4e413e37d9f5a3a2cb34787f2fe3ea1acec
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bharatceramics.in/ckfinder/userfiles/files/38145345088.pdf In PDF document text
    • http://hanleyresources.com/images/59140127764.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/8863423861.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/76890555910.pdfIn PDF document text
    • http://lenaoyunlar.net/calisma2/files/uploads/lunanetaxonizuxugazaweb.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613258dc06060---nanupuzegovebadilibumase.pdfIn PDF document text
    • http://www.pvvc.cz/files/3879953023.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba811235c7---51332223627.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/zarurumimizeput.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/vifumavewezemulawujidux.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/17142871194.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/13385863308.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/10756583516.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/verifudufitetesebim.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/24397007946.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/bolutomasanoxozako.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/dovapuxukemudop.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/wawabinazosisi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8dl53aovr1qkda1cd75l7ejrb1/81887573505.pdfIn PDF document text
    • https://naukriguru.com/php/uploads/file/37243835760.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/tejimifiwojupuxugiwamano.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/81732974069.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o6ml5rnh301k07k6gg5p0d6rq6/xufegifopi.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/85593127335.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8087052c0b28699ebf210408ca429829/naduzujog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sat+writing+and+language+practice+test+pdfPDF 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_off0000b4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C1 14448 bytes
SHA-256: 1fd527323ba3b7e15ca41d1fe9529c614f4e7c9c55c70e6bae80e7653063bf61
font_01_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 10936 bytes
SHA-256: 7792276bb5e7c884f224586d59cd95ec625b5c5695a6e7e4e759a546e713457d
font_02_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.