Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f25e08d9aec07b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-22 21:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02c027442cbebb746b8df884d673b2f0 SHA-1: 0c1be2a9043be398d862d0120eb34de3d07a0fc7 SHA-256: 17f25e08d9aec07b35ecbc5b2cfc22377916982bdf9df7e340a3487b9bbc128f
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to multiple external websites. Several of these links point to compromised WordPress upload storage, indicating a potential attempt to host malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://catherine-massage.com/ckfinder/userfiles/files/mobumudaxuwufamot.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/292c862d70060fd02e49fdc48e6cfb8f/81854472678.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///35567823168.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/lavokifa.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/50182991061.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/17/17108792829.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///37963142195.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tubutimozexefivokukipu.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/penezupoxamunopuzizefale.pdfIn PDF document text
    • http://eichler-kammerer.de/14236871962.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/rufetomag.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a010ea8bddc6b46df48cd852883cda3f/resufuluvajenafufomew.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kufotew.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/89694126758.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/gixinojopuribevikig.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2a89ad0ccf19bffd320de3089c56b128/23358994224.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/23272400812.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/u6h52j2ngf0gs764emnh425duq/18544096328.pdfIn PDF document text
    • https://sentralperdana.com/file/dafilokonajetevakuwisuvu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-17/20210917122641478131.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/48073174407.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/58400226447.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/14545846129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=big+words+that+start+with+aPDF 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_off0000b9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C3 16444 bytes
SHA-256: b022257c0272a36cc996f47050b2ddbb664be3eb08f777e6bd632e0e87f3b98a
font_01_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 10384 bytes
SHA-256: 16d0c251e56967baba745a7caae485de2cb63e6fd032f17625e18508e487ce88