Malicious PDF — malware analysis report

Static analysis result for SHA-256 85720ab55eb0aab9…

MALICIOUS

PDF

80.7 KB Created: 2021-06-27 14:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 94aec6c5c316f2ba16f4192645587c45 SHA-1: e7531436092df9c993a4c7f97cbdc137fb877e71 SHA-256: 85720ab55eb0aab97cd3adf03158c70c41dc60bfdec26d4125ff3475a9291e96
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host and distribute malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple links to disposable or compromised hosting reinforces this assessment. The document's structure and embedded links are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9556f69cd4---jisebodirazirinufakeze.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d3e4b9efad73ea36b8ceac745dbce739/navolataketupe.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079901e8c4d6---vadukugagefad.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607508d3179eb---pejud.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160889d2d344cd---jevuwagiturusidezezidab.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078325193a3d---46655621573.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/finijezijekurafigaba.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/72632721762.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fd1cdbb93---87864652059.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/18456629622.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/xiwekivizije.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac911d1a054---rojetumelep.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2de6d6547dc38282868a0f3e4331df6c/juzukorupajo.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/70376767379.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/7ca7kmb75lj0lrocnemi9au5c5/54237658793.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978b872e73d---95709465726.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/bovadubo.pdfIn PDF document text
    • http://shophouse.info/images/files/71634387667.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/pevuvek.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b5b85fc2aaa7497bace91a166c021873/weguvijujuwavetur.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/55590172553.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/badixapudewigajafeguna.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a94c4d59c24---lejugajorefer.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/80973766996.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/zekelaruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+to+word+file+converter+downloadPDF 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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 17052 bytes
SHA-256: c6a7ffb3832b8c56fecc311cb62be3421ed53cbc81709f817fb03c69d49bb4ff
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 10456 bytes
SHA-256: bbb29f3615c672d517372239090168c682ed2bdb5b3ccb916129e38657fa1c49