Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5e2a733f9445d2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 20:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9faec5f4dd79830db5a030d7c546b4b SHA-1: 46b644968cdf319fca0031b85639225e8be04eef SHA-256: cc5e2a733f9445d2d04ddd96e0818e078979626b347c1df6dc26a8d710b1e9ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://anhuicrew.com/upload_fck/file/2021-4-30/20210430233145346519.pdf In PDF document text
    • http://studiorapizza.it/userfiles/files/93868659273.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/59471660090.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/75268689335.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d2ddb1c87b641a46090872e6a16615d0/73316111938.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/94871539716.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/51670452517.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/39809672352.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/zasibeliwamamusuxofow.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/wubelilitorifut.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/15422469963.pdfIn PDF document text
    • https://flomogroup.com/upload/files/liketuv.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/tovetiteret.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4uff4njkd8hpndnbbahkcttsn1/pigeniwase.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19ffaa1180---powatukifu.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duwojunupezarigome.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/257b39e1816884013db0323074f9a6dd/xewedawolaxuvogikukos.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ek4cjvdh12ht9442o11nu3kdkn/kigaxi.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/74029417157.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c372f424188---28214311756.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607614c6d8f00---jageterasuw.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/46075648941.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/ed2936fd49a3245af7d13ab3f28795d8/pulunofonoketawosigawigiz.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/21706122883.pdfIn PDF document text
    • https://nexusmediation.nl/files/visifirodufukilojavirakiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=red+blue+finPDF 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_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 18052 bytes
SHA-256: 5959dbbf09ea54cf994e50a4fe1ae4a4a050c909336209e07913a9e62c0e96a8
font_01_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 9984 bytes
SHA-256: c7f82e4e9335a6609d325b00ab5e8dad066b8c68c87acc8b80a9326e3387ccd0
font_02_sfnt_off000130ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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