Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f2cd20bcc726fd…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 22:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1492f1eb9677bff331a564ddd3774133 SHA-1: 16037aa7ff71315a5e4461f894d8b87eaaf4c173 SHA-256: 18f2cd20bcc726fd9a425030861a30ccbf61e5d97140960b47fb235fe7dcc625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, characteristic of link farms used to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alemotta.com/resources/original/file/palegowukases.pdf
    • http://sitoad.com/bbqjoekey/files/202109260835419789.pdf
    • http://drcleancenter.com/uploads/files/202109200312332207.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615840ba3fef5---73823250602.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/dafud.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a096e9d8f---mugumi.pdf
    • http://www.agot.pl/upload/file/13077326360.pdf
    • http://rogersdesignhouse.com/uploads/files/fuzebizatamizutinizipis.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/kuvaxenazo.pdf
    • https://baobiachau.com/luutru/files/robubususiruvufaxob.pdf
    • http://biosite.ru/images/news/file/gapavegaxupipaxemopa.pdf
    • http://tlumacz-bialystok.pl/pliki/file/nugunidixazifadoligonuw.pdf
    • http://wixoon.hu/upload/file/wefij.pdf
    • http://dokumsuzgec.com/userfiles/files/nisifogesevonalajimunite.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143253965389---2325543801.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/pakulosusuzesiged.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b792582c5---30818836794.pdf
    • http://phamtrangia.site/upload/files/38631164713.pdf
    • https://ptogel2.com/contents/files/66030363849.pdf
    • http://archissimo.eu/userfiles/files/61597893734.pdf
    • https://rayvoltbike.tw/geektic/files/dakokagava.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=set+for+life+results+today
    • 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_off0000b075.bin
48da476e07e6f7a3974bcc96ba4c95d6fe5ab69638a9ce2167b5477c63aca127		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB075 17396 bytes
font_01_sfnt_off0000dd5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 16792 bytes
font_02_sfnt_off0000f574.bin
4c262b264ff43d0d25218f30240c063a7be3c3f143e4a16ffc9cc79f7306ee3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 10532 bytes

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