Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93091c106e28f90…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 20:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f9ef94febd1cc71c1c79d8039b7f3c8 SHA-1: 4a8e4ddec025f5f381218d8a0d20f133fad9ce4c SHA-256: a93091c106e28f9060ece767aea2fcd537b4482d335937ba2cb2091146afd4e8
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, and the ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/gebofarosokisuziwexogu.pdf In PDF document text
    • http://www.77ice.com/upload/files/gomizijunamozejimobiji.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/vudax.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/92679970786.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cd4a9ac58b38aed6f47579d34754fb26/guzezabapuwo.pdfIn PDF document text
    • http://chinalabware.es/d/files/vaxawox.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/varowaxine.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/34911711534.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/zugoreturofizelonuvow.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3ce07e37---72692181564.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/24014869510.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/potigekebedurigapopig.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/67506795851.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/96979772783.pdfIn PDF document text
    • http://cortabellanews.com/userimages/38699366855.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/vafilugukurixatijenixe.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/mefolowosijavopuwemorupu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139522c3f572---girabowotaketus.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/80221733335.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/23931292417.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d396655e61773125a1ce7702a4127383/nepad.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/wamajolebavadiwimolaveji.pdfIn PDF document text
    • http://calisnt.com/uploads/files/lurexovobitejiruputoz.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/28075133356.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/418b5ee424718574dd87626ce65fa2c8/15325756019.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/87515226773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pes+2007+ppssppPDF 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_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 9816 bytes
SHA-256: d3ea7cf2589afd2ad7dd7342393ccebbe0f22db5fd1e29b7ab8ba93b380703fa
font_02_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 17432 bytes
SHA-256: 2f7f4fcb8db64afac884a3e1d3e347fcdcde55abde9b7f64634599f0e910a85c

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