Malicious PDF — malware analysis report

Static analysis result for SHA-256 291f65fe0b445517…

MALICIOUS

PDF

109.4 KB Created: 2021-09-05 01:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5b34da9fef5d43641e33544be153d96 SHA-1: 29365e271665f0e0a1c448cea51ba157367ac27b SHA-256: 291f65fe0b445517ac9767ea742d0bf94f17adfcda673dbd95f96652a78850c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. This suggests the document is designed to redirect users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://austral-immo.com/userfiles/files/vumuned.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/27393551085.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jijowofovizogubenijos.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607819a074414---detadadumeda.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d77a73457---85010002149.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/wixojuburepoben.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/risobebakitezorogekalano.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/66d8be63ebd85805e72fe81ee543c630/63299962247.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd208728c6---bupisuwozureb.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/99737664618.pdfIn PDF document text
    • https://masukpt1.com/contents//files/8468252191.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/pofofalufokixaxixosijivo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/v7mon6qahbmo9v3nlt2icob5fu/1662087784.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/11001228683.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/zukujijerubepazomizer.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/danopedisujubik.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d980090758d---94114521027.pdfIn PDF document text
    • http://idroter.org/userfiles/files/59185112406.pdfIn PDF document text
    • https://people11people.com/uploads/File/47008202988.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/81549444727.pdfIn PDF document text
    • http://hidropro.hu/upload/16027821584.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wiwowotixesokaxoxegefad.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/17114482568.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/lonuxewolevosal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=language+variation+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_off0001446b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446B 10584 bytes
SHA-256: 18c98b9d658e497e67dace1c8d2c627de255623031c7243955133fc3408dc42c
font_01_sfnt_off00015c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7C 19700 bytes
SHA-256: a8040ef3a4bac9d9dfa39fe5fada0a241927fa6b38d10c6f830a9f0ee8dc1365
font_02_sfnt_off00018fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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