Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e078054135b33f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 18:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38d3119901b1f0d77380eef60fa8811f SHA-1: b4e376871bd7437b8e50f9c51a4ab4c1024edc67 SHA-256: 51e078054135b33ff1bab7514012d0d0fbaf61e78dee6d882ad765944c4b65ac
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, including those hosted on compromised WordPress sites, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as malicious and likely phishing-related. The JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gencatakan.com/upload/file/68840559564.pdf In PDF document text
    • http://bisenzia.it/userfiles/files/66426552150.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/tusavejexowives.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/zixilowaripexif.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613805ba6e538---mitujog.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/sevijig.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130c53399dd5---sanajogaluvemi.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/duvijanosaromikisisi.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/9755053265.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/jowametugegaxalunugefefa.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/ritererojape.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/movubixoguwikawomirotulu.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631055291.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c376f96e4d131ed2ba28491a197118aa/supakabopuw.pdfIn PDF document text
    • http://hrudolf.com/userfiles/79698671886.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/4171154985.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/wanap.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109051209415862.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/367375651.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/wepunolafuta.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/550d6d703dfdb0b8fdc29564f9bdc733/xuxujasafemorogizikuba.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/vuwovimebifepilibomafafip.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/25302738967.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/88502091729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bms+system+books+pdfPDF 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_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 16820 bytes
SHA-256: ebbc733eeb2d7f1971045160675894e5d6109b68968afc4a3373bc9b6b28d35d
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10556 bytes
SHA-256: df1ba13682fe1cd6089692d2c745cbf29897321f08ce1f685db85337279e5464
font_02_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1