Malicious PDF — malware analysis report

Static analysis result for SHA-256 232c5ae0879a8cee…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 14:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c10b033c1c63d3a26120f00462d21490 SHA-1: ec83dd41c6549e87c10e424e17b64b7db1e98584 SHA-256: 232c5ae0879a8ceea7a2a9efa6c69a32d6bd06100e30bfa81b99f36abb3386d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=roll+and+rock PDF link annotation
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607caa04e2dbe---70244482932.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/28627163600.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3bb97b5e---35796600785.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/kovikim.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/19772965049.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/cf0cf37938c5308130ab93999e5f952c/monukujufirolirigovemonor.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608035daaef39---nutalo.pdfIn PDF document text
    • http://szpk.hu/_user/file/45372970732.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/nebunudemigifefabinefam.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a7ea5436866f18c73535129408923e5c/rawaxebibidumovidet.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gifatan.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/61036841058.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/ludevitiwakuxisipugi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/s2t1fs0mp0cohi1urjlamllre7/nozepurifa.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/detibadabirirej.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc8b81be1a---sasikefu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/83597407b4ecbde7c3456b7936b1ba5a/68306419684.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100507262346.pdfIn PDF document text
    • http://wamer.org/userfiles/file/sofadus.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/d0kupejcad956har5iumf7hnm0/manud.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c47955540ca---44313021992.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/fedarotofekose.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e86df9a16146fc5ab6ab3d077d80059c/lesotalub.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2nrtgc226m4kjue4fpm0v0mknp/gimesova.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/84aodmeuk51uhppho56e5h0aba/87756852801.pdfIn PDF document text
    • 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_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 17412 bytes
SHA-256: 596b57ad30bb419f376357b65538cb88da9ccf62d93ef3be6dfae0d9fe8ee609
font_01_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 10008 bytes
SHA-256: 82764cbc156426bb05d6cdd803e192b5c06834dfb535ce77fb4480e4d0ad7346