Malicious PDF — malware analysis report

Static analysis result for SHA-256 491fb196ed261293…

MALICIOUS

PDF

75.0 KB Created: 2021-07-31 04:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d47a724f24c1ab165b26cbed0ad5ea02 SHA-1: fa89eb656971763c2656f35c7ad91f17d3031ab4 SHA-256: 491fb196ed261293379c93e6fd237b3bc18f6321ff107271315c1bc42aef3f70
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on compromised CMS uploads strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://chcial.ru/uplcv?utm_term=ibrahim+tatlises+tosuno+mp3+download PDF link annotation
    • http://altelaw.com/uploads/image/file/50941232439.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916cd3b246c---71160569479.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a631124807821a7e9c4c9aa63cef5371/mimusuwepaxexavusex.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/24636909919.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cs6oreln8jb9gnsft79380ql96/jorifetuwojulig.pdfIn PDF document text
    • https://ancoraeducacion.com/images/naxixuxadawa.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/eb82e604081142b8b55c756731241a53/bujusosofibaluzedarexovo.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/lumalese.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160715843d7e7d---42631005489.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/36b0798e8ac825a166f77c3aea9e6079/91758283997.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba49edbf35---musonifenofukezomojop.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2714d364eb0cb82094483bf9091c1ed3/kojurakolexik.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/warage.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/4035360851.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8p4cr6knqtk3f8nh94t8nno54q/68224602563.pdfIn PDF document text
    • https://kultmotor.hu/images/files/pozisu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d2c09771fe5def162301c2673bc92ea/zenajefininoperaf.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/32006801899.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/subuzanaxizunodo.pdfIn PDF document text
    • http://zkpower.net/upload/files/72601137040.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b0df442b99e6a69df0dec795cc2b1560/kibatos.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/20770064231.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zebedasizipirajaf.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/884c094fb69bf5bc83599dddd5de2a43/bipaxaxajitenalafevafe.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e6ae4c8214d532e2692e0f307456a143/40322629123.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_off0000c052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC052 17808 bytes
SHA-256: d174f61423aeb332917cff9895b7b3148a06b0683557764699a7ca069484558e
font_01_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 11108 bytes
SHA-256: 17434a44f8169c2768cf4caee37f1e9d481301fb48aca6369727da22390182b4