Malicious PDF — malware analysis report

Static analysis result for SHA-256 3593150fdcc4b66b…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 19:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33c7f649292f60fc9464318af46f5246 SHA-1: 2530c254f92d9230e47e5cf2179ccfd8afe5a391 SHA-256: 3593150fdcc4b66b64061c63883511044fc4b57554ad0140354918975058bc94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the PDF structure itself are indicative of a malicious document, potentially exploiting a PDF vulnerability to execute further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/37d5b557446fff18ab252449d833f7b5/vidudimokotigusu.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fb352a0cd36cee8916fb64ceb561fb56/6844495533.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160963c9843d24---35586741285.pdf
    • http://maynenkhiinverter.com/media/ftp/file/mekipivonelosateku.pdf
    • http://al-bandak.com/userfiles/file/nonuvuvejega.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/059edf16c19c426e85d059abe8feac7c/dikikazuxelafalosajoga.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a50dbbd6---65045972655.pdf
    • https://people11people.gr/uploads/File/rojaxor.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dd3bdf1132434c9e0a119f01dee97bbc/pigeduxodifam.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/33344825ae1f71804417fa811d324021/vubizaxugibixafotupig.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16094670b068af---22988495698.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074b48409399---gifixevinav.pdf
    • https://rosycaffe.com/file/87532709443.pdf
    • http://s-privod.ru/userfiles/file/1695507593.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096484e2e53c---29765996912.pdf
    • https://foundryindia.org/userfiles/file/97572068622.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h9fhhm5722l36pv5t90rpt4jfj/zujenipojofusowikidowu.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/48edf15ad2e69d82c4dd1061ceee3601/39766651604.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fmlun3cp033sgmcpo4c9u4vgmm/76402276479.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4921d65b3a---57665565212.pdf
    • http://nowyhotelik.pl/userfiles/file/49528077551.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d37a1ee31c87d08be4d981856dee77a0/vobixonosorojipagefu.pdf
    • http://feynburg-uhren.de/uploads/kofazifobunozadanazujes.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1hepo4an98s25k6jgbvtjea2s0/28252192738.pdf
    • http://biomassasia.net/data_ed/userfiles/file/bizifonuzemenivalipagobog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bible+verses+that+talk+about+success
    • 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_off0000fee1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 16792 bytes
font_01_sfnt_off000116f8.bin
875ea7f0d40748f02e83650a05408ff08736e1949d0778a69568c15f0353249a
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 10672 bytes
font_02_sfnt_off00012fa6.bin
cc95acc01598c7b0fdba09752790c370628d984cb2ff6e2a3cbb1d33181d238e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA6 16936 bytes