Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7765097f9e70b2…

MALICIOUS

PDF

87.0 KB Created: 2021-07-23 11:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ded86de467c2bf990b3234d99a7fbe33 SHA-1: d2f2a1ddc9d17bbbcda319716a98d1fe3ff24153 SHA-256: aa7765097f9e70b20142f0a08d4d90e8c02b929f3ad7b0fa0ebaf0d2d2506123
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness. The document's structure suggests it is designed to act as a link farm, likely for SEO poisoning or to redirect users to malicious content hosted on these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studioboscono.it/userfiles/files/nivumerom.pdf In PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609c46e0a4f04---53232933317.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/04667fvpp4ugfapq7oe8e4fo4k/gixodezasorozawajufuvul.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/holvci8b51itqn3lu2uulcipbp/xobijev.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/divelusuperakifedus.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kefufomosifimoxer.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0f514aa6---41534730316.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061812312670.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/71101598160.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/lakaredoworobowez.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/41108450810.pdfIn PDF document text
    • http://hasyo.net/files/file/kepowexizivitelelagebeg.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082e087b6c5d---nizopisifumesebiw.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608778556af0f---99458231205.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/533aa75d0a4d3eab7a7812086d0c75bf/49763768025.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/mukavudumodupideso.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a16878d8e8f---zudononetofazigi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb983fcca---57444621602.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/pebezazidedipofubuf.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a496e8438---9958703527.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/ditura.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/96435291719.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/sigenudakoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hands+on+hacking+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 17216 bytes
SHA-256: 34145577b76ebdac4ac833289abca28da6d846db1e8b6ac4204de42c409250e0
font_02_sfnt_off000136c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C8 10604 bytes
SHA-256: c54734e2d1bdb1d1b499f629fcb9a2d57d3101342f1c42b66eceafff7aeaed28

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