Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf9dd186934303d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-29 00:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e3ff978e1f5fb96068d8ab41443d492 SHA-1: f983888fe1e8b68708d5112e6f4b81845d105aa8 SHA-256: cbf9dd186934303d4ccf9821c9bcb85e972c8c2a6647ffefe20b2c029abdf468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=war+chhod+na+yaar+full+movie PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a1c7e8d4---voxerobuwomuwukutesebemut.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210923225929.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4424630d---40272840351.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/17835687769.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/likuzapur.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a4c996b9ab8f215b6f7c972077d0e3de/suriba.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/38492491025.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/af02a5b4fe371b2a16332557766bc305/buximatasabodidejotizaw.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/53255685131.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/dupoloja.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/26907389534.pdfIn PDF document text
    • https://luminex.pl/upload/file/lebasu.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/84249845947.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/62244929338.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de221efcf6---93360262494.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161512411681cf---75373553767.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/15693948402.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/topesopezasivemijavefoli.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/bagaj.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/21673350281.pdfIn PDF document text
    • http://deforma.it/userfiles/files/4007105283.pdfIn PDF document text
    • http://orthopediedelft.eu/files/jepelaruxeropugakopamu.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_off0000c133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC133 18784 bytes
SHA-256: dea65b70b5ef2c1bf19fed18ca2614d675f425d9e1a3f7dbf46ab1364eeb4826
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 10748 bytes
SHA-256: 2df59b5dd98799e2bbecbf35c11da4edd661abb9e188e970ba69ea1c3b7b13d3
font_02_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1