Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb671b5040b63b54…

MALICIOUS

PDF

81.6 KB Created: 2021-08-25 06:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f9d4bb106afe26cad009a560a07fe40 SHA-1: 51356ac2604629bd4995bd9e758901978aef5806 SHA-256: fb671b5040b63b546259dcc4d046e80c9d36aa9950c5c648b70b6e010d884c2a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://thevelascofamily.com/clients/11614/File/sevewidazevivulodorid.pdf In PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/sukosefadorade.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/40652826952.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852a8c721c2---2498715675.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/67648d5947876342824d4096a9fe01a1/6719495091.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/zerovukokixaw.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/kapinagizomusebas.pdfIn PDF document text
    • http://guchenes.com/d/files/16934923283.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/36479266346.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/42890071583f8055560377aec591ccd8/91988741648.pdfIn PDF document text
    • https://hirurgija.me//files/gufaxebepixi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e97bdb21e---68609716329.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/nerofovelunupalerupajag.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/84439528779.pdfIn PDF document text
    • http://aimic.com/userfiles/file/fifinijenesik.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/l190aimorusj6qagbfsafveo27/medabibupuxabigurami.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/88058723181.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161179a42a09f4---sokekejarerebal.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/nabonepoxafukar.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cd9b5b78---79282566968.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/vekiniroxumitujilise.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/23289460759.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/jijozedopobo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ceca8e6a0f3c4c4b7b0fa7095cf45fec/nuligulixula.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/wujofazadazebotom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=white+yellow+color+palettePDF 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_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 16208 bytes
SHA-256: 45115b0e5c43c87c8aaeb752ac824f05804356f1589b0f379243942fae84d2e2
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 10392 bytes
SHA-256: 8dff75094514f467a5c37891a221891eba30c27b51071b13e8cdf962b485bba5

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