Malicious PDF — malware analysis report

Static analysis result for SHA-256 09091cbedfd697fe…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 03:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f7aa51bf8ded6c6969df8221a60212f SHA-1: 7397cf28d98d7dde7cfc15230b08b031d323bd6e SHA-256: 09091cbedfd697fe61960c559f48d47bedc67bc63fe5e21f26e898b60997f557
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various PDF files hosted on potentially compromised websites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, providing a password to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://honghuibio.com/d/files/jitovivekemomilarut.pdf In PDF document text
    • http://www.mostenpo.jp/userfiles/files/begesix.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/56031588070.pdfIn PDF document text
    • http://wsm.hk/images/files/wuwurojolowabisukoxasa.pdfIn PDF document text
    • https://mkontroll.hu/File/13527394951.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/rijawukemaxapoxojina.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3509ad5b9---87554425589.pdfIn PDF document text
    • http://4bx.pl/public/file/wepakodegetexigox.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/rce1eevmvvck4n69lsdtovir6q/81065786205.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mhses1h54ks4kp6rdjjpos0nf6/24325930634.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bdac77245a0d87dae73cf6f79e48c199/gevofas.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/xugejun.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135fadf14e86---rivemexixosavimuxufad.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161356876985de---javudatil.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/jidujeje.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/wuvelufa.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/xumuzopebuzemosovu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411de5f0205---97400088527.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/bozat.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/zamositako.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/86743985929.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/54178491262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+unlock+tool+crack+free+downloadPDF 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_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 10560 bytes
SHA-256: c8f7b5c04a5259a276ff0dc8ae0a37a64c2d7875795ad9e187222b44b3281c19
font_01_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 18172 bytes
SHA-256: b44ec0b1731d5ffb2dea3c5e7a870e46d10403b73ecd1fad092f0f425b903a38

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