Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6162b5b32ca5b60…

MALICIOUS

PDF

86.8 KB Created: 2021-08-19 19:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fd5ce01f0ac6aaa165e0751d4e90d16 SHA-1: eda55e7fdd55a702750bd5bcb2531887c1cc5183 SHA-256: b6162b5b32ca5b6022d279ef07dd22b546adf8f3fb6d880042f2645f7d31c373
96 Risk Score

Malware Insights

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

This PDF document was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. The primary purpose appears to be directing users to external sites, potentially for further exploitation or to distribute other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebbe4289b---44201022322.pdf In PDF document text
    • http://evolution-dev.com/file_media/file_image/file/laridexivaz.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/97639889071.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/85779492593.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/88295030061.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad0102209d---54100219866.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9b93db154---fomilipumizovogajavu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56e4fb5e7eba348aceea00ed63b017ca/89442297449.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108fb9660eb8---48640555712.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0831412001620825041.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021771228305716.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/nupujixilovanikoxebi.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/65546194484.pdfIn PDF document text
    • https://webmenuplus.com/images/file/pukor.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/mewokusutokorebujifuputil.pdfIn PDF document text
    • https://irrisyst.eu/files/file/24699939790.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/fb984a2a178c4d001d665fae552734b7/gilalof.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/biduwovovuramigoven.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/12148724554.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/nijemolovewebo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609648275be57---jofivebanazuvefebifigaved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+a+singer+overlock+machinePDF 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_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 11012 bytes
SHA-256: 37843aaa3e67b8c0c87af523b769b92bcff4a38d3d89b2425c424f51c31ebe67
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 17676 bytes
SHA-256: 20f606ac325c0e9836f12016b4a68946c2973b667a38e5590c349dfb90eb9bfe