Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec19aaea7b96141…

MALICIOUS

PDF

85.2 KB Created: 2021-08-01 19:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 859d67e1eede5e9b5a1d2ad953ba713a SHA-1: 17005529ea8f5973bfc0376dddb8c3a3d4d8cf07 SHA-256: 5ec19aaea7b96141a0c3a041fe772dfae9a42a2126729325ed5249e09e0f043b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, rather than executing a direct payload from the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=how+to+make+a+homopolar+motor+from+battery PDF link annotation
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5c66fac7baedae437ffda798170036b7/85009563168.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/32660288116.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/kaweduvuvabiwuko.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1223fbd8---34568891563.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/fifega.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/63600648384.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5124d49f6---nalojom.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/53685496755.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f16a7b9d3---junulerumi.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608b32fd098e7---buzupofoloneke.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/witibagudijunofubixupu.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/dozobefawin.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/47574322172.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/nelolesamiposulifatim.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/47325577952.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/xugedamerita.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/mezafofawusovemiv.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ec21403bc319af5d2d2abe56bdf4fff3/8340593920.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f675383d---domixeviwotesunusanudos.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kjr8774p5ufvok3j8ubqdpda4a/52755357067.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/20851627969.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/jopibidojewagix.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/62905599782.pdfIn PDF document text
    • https://tessuno.com/upload/files/6105530d06780.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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16420 bytes
SHA-256: f52b891247fb9ea580c2a9463dd73541948e219f3e121fb7e40ee5227324d51a
font_01_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 10680 bytes
SHA-256: 249288bdb16dc8e644341410b663ddc3d73bf2182c9f845207bf9fff4f8c7160
font_02_sfnt_off00012eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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