Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec78f60cbadd4f9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 04:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cab20b55939aa445e9948fd8595c4ffa SHA-1: 78a114f31e8a275e2c4a437f7cc7f822abe7344f SHA-256: 7ec78f60cbadd4f9256e6563b453db9b200d0afad83665a1944dd5ab3978c9e0
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm or distribution mechanism. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and URL patterns are indicative of a campaign to lure users to malicious content or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://0225674989.kad.tw/kads/ckfinder/userfiles/files/vegod.pdf
    • http://quesnelbusinessnetwork.ca/userfiles/file/69195250667.pdf
    • https://www.hippocratio.gr/ckfinder/userfiles/files/94326616175.pdf
    • http://palestraarkadia.it/userfiles/files/8831895281.pdf
    • https://nocenzura.space/web/img/podborky/files/74187005247.pdf
    • http://residenceraffaellotorino.com/userfiles/files/16041162005.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ce554c379b5d47c82a0c6a7fa334921b/sirewerepoxomumu.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148befe67f14---42625864660.pdf
    • https://sysyanginguvenlik.com/uploads/files/97935692114.pdf
    • http://stin-verdon.fr/assets/Image/files/ziles.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/51508060446.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/gafisuguzevatotov.pdf
    • https://hlj-vibration.com/uploads/image/20210901/files/20210901140917.pdf
    • https://chezgregoire.fr/userfiles/xuzimumed.pdf
    • http://hykylalumni.org/userfiles/21985558023.pdf
    • https://landatur.com/files/galeria/files/67555779973.pdf
    • http://artsar.pl/userfiles/file/48779461078.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cffac6b68---14336266835.pdf
    • http://miskolciharsona.hu/pictures/file/gexadopifinowozejafu.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613684841582f---deremeb.pdf
    • https://biroestarsa.hu/uploads/file/zumugibonaxewamim.pdf
    • http://norilskgu.ru/userfiles/file/29635483615.pdf
    • http://avatars.ru/userfiles/file/87743156746.pdf
    • https://ganganagardentist.com/userfiles/file/39419404536.pdf
    • https://manhalhealing.com/userfiles/file/razazuku.pdf
    • https://www.esfa.bg/root/ckfinder/userfiles/files/mezofuvog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+send+to+voicemail
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e686.bin
dc67208a6945cd8ccba41e1cd9aa092cefcba57f5ce67335bc8b81cda40607c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 17816 bytes
font_01_sfnt_off0001140d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 16792 bytes
font_02_sfnt_off00012c24.bin
b3afc70526c73b7c6603e30aa9ed159b13f19b764b0e3a06ad2e7921a16c934f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 10580 bytes

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