Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6effe7cedafe0cf…

MALICIOUS

PDF

86.2 KB Created: 2021-08-02 10:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3febf244af51efdebf1b7d3b83f2f93 SHA-1: bcfa64a777206de9c135cd64255a675ebc0a6f23 SHA-256: c6effe7cedafe0cff0a387ae5b74e030f450edcc1eb3d6e014d110ba13c3b64d
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting sites, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs reinforces this assessment. No scripts were extracted, but the structure itself is indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://slide-bearing.com/d/files/42770010962.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/44475452808.pdf
    • http://sva-jeanroze.com/xmedia/file/91114847426.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/p7sntg0esu1fa24nlj0g2a3c4a/nisesagalodoviz.pdf
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/21332079597.pdf
    • http://svatba-emi.com/uploads/pages/files/41338406055.pdf
    • http://sjhrz.com/images/upload/File/88967222791.pdf
    • http://smartarts.bg/userfiles/file/51633148219.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27bc5bb3d---32253867161.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7998278287---gamam.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/cc3ea9492e021067283648a32b0180cf/revipifugafuwejiv.pdf
    • https://capecoralliving.com/media/file/dopularikefejibak.pdf
    • http://aaykpn.com/uploads/editor/files/59643302717.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/zipifa.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c7be4cf663bd740884997752e6e8b18a/wefibikafukor.pdf
    • http://innovatepc.com/userfiles/file/doged.pdf
    • https://drvishweshwari.in/userfiles/file/94309762271.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5dd257cee---wugetoxabawo.pdf
    • http://dermatologie-chamonix.com/userfiles/file/66060203609.pdf
    • http://rc-mst.com/mst/_upload/files/nevere.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/20328201234.pdf
    • http://kokocurry.gm/userfiles/file/30610229996.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adobe+pdf+writer+free+download+windows+7
    • 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_off0000ef73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 16792 bytes
font_01_sfnt_off0001078a.bin
441b148202896507c70dffdb265dc6c678c54326de5a7e980c933e043e4f221f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 10748 bytes
font_02_sfnt_off00012043.bin
78220e9d4004a6785eb4fea043df591f99369d247ad87d373a79c6dc559eb284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 16296 bytes

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