Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa6a3a6a0889d1a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 21:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 969513fbce57fec9779e6cfad4b3130c SHA-1: 88d0c6da58b1af4a5a1924648d3083ae5440d2c4 SHA-256: bfa6a3a6a0889d1aaf63ca60a3be059683dc53f1f6b77c820bfe555e2f8647ed
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm strategy. The presence of a 'download button' lure further supports a malicious intent to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=batchelor+an+introduction+to+fluid+dynamics+pdf PDF link annotation
    • http://iraneto.com/basefile/iranetocom/files/nipuzopopajirefixozepu.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/3412567201.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/59537985961.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/metemav.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1bff4db5145960c0374a82ec6822b326/zezarebosupumufi.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/28458494164.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/gemunonategedar.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/xixigojolisetofaluxamuke.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/fesigolusofojefojad.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/33237388686.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/lavuzidobiw.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/28454652777.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/84425007248.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/difereberamabadu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/sictbs4ckkic213n8tpgp1kknc/sukoxovexunek.pdfIn PDF document text
    • http://ijfbn.com/editor_up/90480478293.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/bejorutegomofibeguleto.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613970d4a32de---pewapas.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161338d9f96d46---16499992080.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/kiwuno.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/18973658755.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/65828733236.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/37ec8cd932f7c90397038c85f54940f6/tivafokatufek.pdfIn PDF document text
    • 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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 17600 bytes
SHA-256: 62cfc0da5180535462ddb166df55c4563b6c2d9bfef487b9f892c239aea9ac64
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 11152 bytes
SHA-256: 11e99d66b0f18bc90d83d117abf798ad958875e49ec955db5ec48b37996b1b2e
font_02_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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