Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afae9ef568e589f…

MALICIOUS

PDF

83.5 KB Created: 2021-07-14 01:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea6b049891dddd2e2e7a7e4f61e63f0a SHA-1: fef9a149b48c8f6ef2bfe79536d95d94f707ed55 SHA-256: 4afae9ef568e589f9147a358e9a20d3419d58d1d5a774cc69bc8e4daca16234e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to exploit users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://elisa5888.com/shopadmin/upload/files/sekopiwijanofisavijubexur.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608065304a44b---sorajamililikopedoj.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/58298704744.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/65214254658.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/85f666c12d7358a328c24e5cab469dd5/fafixedekoperola.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/41bdoosk5v3r0nn42fp6fnm9ro/42143526459.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/56691356604.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf948f72ae8---gebonizizebe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a6daec76---kisotozetalu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/kutaluzimunavizesubumu.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ad173c44b510f05fd9a204ea0bbe1daf/39810055643.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/duxinaravu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zelep.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b1067e97---fogifakopizafitelejawuwof.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/rokivivija.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608683643b532---37517920272.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2bf9be7f599e23f2700373cc666fa3f6/boxubufekiloma.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c441ff88b52---zebuwomekexokajuk.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/kosawomel.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/vasoxomikasabarelabujavi.pdfIn PDF document text
    • http://ahchala.com/img/file/74407589639.pdfIn PDF document text
    • http://thegioioto.store/upload/files/78654562288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=intravenous+sedation+meaningPDF 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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 10664 bytes
SHA-256: 49b8c71c1cdd1494e1605a923350b5a6040a90a4a9b27fdad5aa0f4f75713b8e
font_02_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 17024 bytes
SHA-256: 4194bdf41c0d33768af47bb047d721e8bc2e4f0c067cd1b2aa748bd1b373631a

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