Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e730893c3e459ed…

MALICIOUS

PDF

86.5 KB Created: 2021-08-15 17:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4eb0929187e9eefe1ac96340fee56598 SHA-1: 730a7fb0d3f70f86b163979e412b64e9f4658226 SHA-256: 8e730893c3e459ed4dd6742fe6f9748fb7619ca19700eb9876ce29a359aeeb4f
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to files hosted on compromised CMS uploads or disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest the document is designed to lead users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://foodchemsino.com/d/files/lavil.pdf In PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/nobegurikifodobulad.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/kewegonuzesebitutimemuv.pdfIn PDF document text
    • http://web68s.com/upload/files/72491609503.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/99542908330.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/72265706812.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/58e376avm0u93jdkpvsv7u87db/48761654832.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/36457952207.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/samutun.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078cace90cbe---lewofezufelezuvuves.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/xutiginolamuvaza.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3322e5df7bb40803252a03f45ff79e58/8245587583.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/33709971693.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/46074807347.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/13483182884.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/70611533491.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a08b4b578---77176708784.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/29848655008.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/mujiridap.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/23846265427.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/41043826070.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c0cbf4551c876273b8dada576e83b475/9724321407.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wawubumexawevumakim.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/kf59nfn25g9croulkmovmv8kro/pedimurumimewaduzov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+do+a+process+flowchart+in+wordPDF 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_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16344 bytes
SHA-256: 892041cf8a265e360ab579bae5f0094c5984cae08ca8c0e4364a528208a0163a
font_01_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 10796 bytes
SHA-256: 0b213eb5d3f2f988c950c69eeddf15261dbcb619d1e95c5190f5d8336fae4d69
font_02_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1