Malicious PDF — malware analysis report

Static analysis result for SHA-256 657f475f24037eca…

MALICIOUS

PDF

101.2 KB Created: 2021-09-19 04:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4c34d73ae0c21aa18f709bd64d64d34 SHA-1: 452c7f5a1154eaab3c90de0804a557d9143ef712 SHA-256: 657f475f24037ecabc23e008812e1f2bffb830255062420dcdd4d5cf5f9652cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The authoring application 'wkhtmltopdf' is also noted, which can be used to generate PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pistant.ru/uplcv?utm_term=conjuring+2+torrentz2 PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613143dc1ff7c---40219811031.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/tokijuti.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/bevasigaxo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140cde869fc7---38627558782.pdfIn PDF document text
    • http://groupkaishan.com/d/files/molamajolox.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210910065849715070fgoxgodbly9k.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2fkjt1m6c65qi8hck2u62t8f7a/piliwanisibenuleberisek.pdfIn PDF document text
    • http://logicamail.it/draft/media/xomala.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/semir.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/73786129653.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/geraruminesiwanun.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614538d339e01---benizorazagekikatukiwubug.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/58866747670.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/50406585213.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/84824173195.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1631245999.pdfIn PDF document text
    • https://termoformat.md/img/files/79050500397.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/wilekokipesoli.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/nepinelironipotatilo.pdfIn PDF document text
    • http://halaljones.com/uploads/files/66641593899.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614114fc781ef---lebukimulisekafebuka.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/46664287554.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/duwudirexakijabuporovo.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/55145563076.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/medibudugufudokewavuxuki.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_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 23912 bytes
SHA-256: 24f4f8a575409ff9d64b4d1e2a4d1cdd02180c465b518443b28a47e34a600440
font_01_sfnt_off0001579b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579B 10348 bytes
SHA-256: 4e3ea510b2319b11e61dcbdd68d3717c746a14f6eb2f713f895c90e193435ce3
font_02_sfnt_off00016f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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