Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37026e7463326ad…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 00:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c7859262d692ca37609b4bc6d278555 SHA-1: 156b3e119819d2539edff454391df602ec240825 SHA-256: c37026e7463326ad5b3ed2095707b7027e97f27f4e5644307cd1deffca8ebd7a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://profesa.net/userFilesfile/47335905684.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080857aabc61---42463880441.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/slo15l1bkrvl440ul06iv981e3/50182257258.pdfIn PDF document text
    • http://hncastlecable.com/d/files/67951520617.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/eb9bb1739dbeae050740947e58114e82/18264579128.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c722a23495---mapokezubiku.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16126b34de3ead---zazedewonikabugojuvokif.pdfIn PDF document text
    • https://mfdesign.hu/files/file/miduvawotabobifasoledesu.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/jufapukibefuwiz.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d768f1d22cd983e0914db31562ce56d7/14436616231.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d095a2cdcb0276abb03db006705b1d66/93026804657.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/silibupex.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210825164906_p7av3u.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/166894d6bf23ca3a6e66b7b0dd55455a/bosofalagenedelexa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607952e9db148---85212968107.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8hm1jg1mqtlt49jk7710jfv50q/zesujefupivatixexebu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087855f693e2---zizelegenokodijikipu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/187651f60736656a5b7309653f6ea5ab/50903350392.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/259973603.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/javim.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/37526626009.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/9807390670.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/82790401251.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9355e1149c---26716754203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cheese+is+countable+or+uncountablePDF 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_off0000c6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 10600 bytes
SHA-256: ae77a8696f84302c64ea9148e9d0de27fd99220afc76345d188b1fe7381bf342
font_01_sfnt_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 17220 bytes
SHA-256: 8c474e7fe8665911d65541ecd911ca0d6408710fb8b91a992979b0f2e6fd139e
font_02_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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