Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b271c5953518ea9…

MALICIOUS

PDF

62.8 KB Created: 2021-06-20 09:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83e61b1e376b820c152ec7d8390e6146 SHA-1: 5b53c431c33fc7285eb242df8ad8225327c02daf SHA-256: 3b271c5953518ea9ab43105c662789fd569acbb798a66b423477faf5b257c067
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The document's purpose appears to be to lure users to these compromised sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://huntic.ru/uplcv?utm_term=seventy+nine+short+essays+on+design
    • http://lncxjzxxw.com/upload_fck/file/2021-6-5/20210605021847875975.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0c9a7ecb---3855056923.pdf
    • https://ebooksweb.net/files/file/87718904804.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0f89add9f3b03c900261111b3053c2e1/13573517794.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba32c491f---wunudoguzujupebakepopesa.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/sinebuwukunudufigo.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf51f59a4d---jidune.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092d1bc62069---5155510177.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78872445d5---45055775810.pdf
    • https://artbynela.com/uploads/file/nanamevukakurepamonasurav.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfcc92a2cc---wapatofevawubigaz.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609add33bf0dd---seferufoxaligefidap.pdf
    • http://hndgyl.com/v15/Upload/file/20216181153555059.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607910643c183---nujelufu.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/30tj7ur9q8ts8f21pda0sg8k27/21694667923.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/742d261ad773d5e7a55880d603806346/gujoni.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc5533eed---27635125811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7fd.bin
f8fa095f28f39e81cbac6e4883941f63f59cdf98d366d0e30a91b73106547644		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FD 5320 bytes
font_01_sfnt_off0000ca1b.bin
55b4ad4e5b28a653921b14f68c09cdb7d6607426c2bf034033dc963712cdd581		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 10080 bytes

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