Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c402828f9fa1fcf…

MALICIOUS

PDF

79.6 KB Created: 2021-10-08 13:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8fa1fbe9b82931e3a244be2b9560f8c2 SHA-1: cf27c5f29eddd9dfcff93d38481470be8da35c2b SHA-256: 1c402828f9fa1fcf695c8639eaf79705c7bc744357b17b445cec902d2f38025f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, evidenced by numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of a link farm suggests an attempt to redirect users to malicious content, likely leveraging techniques such as spearphishing attachments.

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://drafthe.ru/uplcv?utm_term=michael+learns+to+rock+take+me+to+your+heart PDF link annotation
    • http://anabakorea.jp/userfiles/file/64226584747.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/57069128144.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/mobodapiwim.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/14729928111.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/kixenanevaditukigoris.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/80051866513.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/be9ebd54f16d021b18908ad4ad8705fb/xibemabafomame.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/xogumerudenevaligemo.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1632351124.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-18/20210918141016172997.pdfIn PDF document text
    • http://clingac.es/d/files/kenalisobizozukizabil.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/bukigalunopaji.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1280c784---18276070770.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161452e92a98bf---bepowefugebo.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/97201243997.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/66542018405.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/46636495044.pdfIn PDF document text
    • https://remini.hu/userfiles/file/xamagafubipedilikonidutov.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/71124141832.pdfIn PDF document text
    • http://contextuae.com/resimler/files/25050072620.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/39150376154.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/rogoxabatexilososajep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e054686e2---32298592443.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/393094310.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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 10796 bytes
SHA-256: 68d51c81c6a25567a01c366a7e1a3d55290d7c0ebd6d3efe7099f28ded5f2810
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 18892 bytes
SHA-256: d7272fe88d4dd5b6687fb02ccd731481155616b2b304ca6aede78bdbd5340d5c