Malicious PDF — malware analysis report

Static analysis result for SHA-256 a758b7cba10bde5b…

MALICIOUS

PDF

85.2 KB Created: 2021-07-08 00:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ecdb28be2b01164f579cfb25ca2c8428 SHA-1: 508f12d9687e7793179c813a2c82df43fa055851 SHA-256: a758b7cba10bde5bbd84f62ad1928b01c5915ec1a250de60bf7254817fd0b7d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d488160c---41798890882.pdf In PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a1f9079200b49c03a3f913ba88d88d8f/nabujor.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/fewoxuwigekawujaj.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/nufumix.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/243dc39ccf58c8d825c67a85650a1cf4/tuxivinigowofuvani.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a988a9840f---53631858930.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vuwijukek.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/atjlugr9l8s77pjlgo2caempc2/dizevezujozosozosiwukuwab.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8372aba8---seripuvepedul.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/80052244856.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/darepazamogiwimufuwib.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87f1b3d5c---ruwesival.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/74925723459.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefbcb0e37---58928326274.pdfIn PDF document text
    • https://ahha.az/userfiles/file/47336515449.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da1a1b6026---33526412566.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ace50de13---71955785207.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/71589925407.pdfIn PDF document text
    • https://nevisnews.com/userfiles/47393583689.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086837237579---tajiliresofoju.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/35214433897.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/62829682126.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34c52e341---ladiwifoletazinawozubop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=c+programming+debugging+questions+and+answersPDF 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_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 11192 bytes
SHA-256: 0499857b3f5fb75d73050e1f4cfa520208c319870a6f2ffde6b6eb0368600e8f
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 17816 bytes
SHA-256: 50461a333384d8d4528ef429d9a38927ae7e6d49a2f064cee6d3d40068d76b42

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