Malicious PDF — malware analysis report

Static analysis result for SHA-256 54050e5b2487de6b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 21:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 525fe42d22faad74257c43986af480d5 SHA-1: 1071764bf1211e793b54001f6710b61368ba56ae SHA-256: 54050e5b2487de6bbb3f560b5017d59a7dea8e7be8a86f2d3fa211c1b4093529
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://haki.vn/uploads/files/60004291230.pdf In PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/8606568891.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/47124288347.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/lerumaruta.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/merexokipuj.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/575327ee7ebd125a2a30386243c25ae6/14176226780.pdfIn PDF document text
    • https://jobtiara.com/files/files/80467081871.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161312f5d61e98---tesozobakixelu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3519a9b88c859c7c85b9fbe6a022c34c/66889376054.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377ac52774c---dutasenosiki.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/2204294223.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/51199595416.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/2307636186.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3767c372d57e9ce93a4c769e50400f63/36842177703.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/sidigitivujukexenemarimo.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/godisazegakibelepubazuvof.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/wigikafinolagugetuxapex.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/tetumimupe.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/fuwesebuvaramizozel.pdfIn PDF document text
    • http://wmsone.com/eimages/file/83980831112.pdfIn PDF document text
    • https://ptogel1.com/contents/files/sanuraweposufi.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/30578114372.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/68633343351.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/koliduxonur.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/saweminil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+stream+android+screen+to+pcPDF 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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 17484 bytes
SHA-256: 2b63dffefefdf9e757beff9e1e9941550fc4c01294a32d56c02c1218d52df584
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 10708 bytes
SHA-256: c490dd10ea8356f68904b1967316d894a9bf400ceb17e4bca68005fe1c58dced