Malicious PDF — malware analysis report

Static analysis result for SHA-256 19eff142c8048074…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 17:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbe3770da93232e586c29f864e3430c5 SHA-1: 63d658a156afc31ee1c4ce62fd5656d789f1ea7d SHA-256: 19eff142c8048074efe6837099888a4dd577e3f65e6b648672a0cd4b183ff910
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site, while the link farm serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o8rs0g1n3fr5utmvdnc3bc36f1/11979107252.pdf In PDF document text
    • https://vayamcs.com/content_files/files/77397747700.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee74c6395---pogitasojojefarerikisuz.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8a29ba8085a2ebf2c5ca8855d1eee2b4/72208804217.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/nebonaxukapalojos.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/ranatopikugowix.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcb2761a2---18193558500.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/77239877406.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9cmi8a36ebhvemij0otjnouq2g/54452834301.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/galofevulezofekedozelona.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2a4a2ab2---25391103035.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/kawaxebitenapodenaluvuwun.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/49779671786.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c23f75cf12825fedac8a248ef0946f45/zutikirumarise.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/95206657806.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/26596866556.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/77790723757.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/lokid.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/luvojemimasajoruzawum.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/bizoxigotofugega.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083400c7da27---32023674975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=altivar+71+catalog+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB882 19296 bytes
SHA-256: 7cb790d6f711c2f6c1572379d82fa260f0162465b54d999284502a571e7e9289
font_01_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 10540 bytes
SHA-256: ca95ed3eba7eb06df9c5f588c17a874d65320b3a91e0b04a1285d2723aa2fd39
font_02_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_03_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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