Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e10fcd9a3b342c3…

MALICIOUS

PDF

73.9 KB Created: 2021-09-08 14:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de194c0222c4dab92a3882db0262a3bf SHA-1: eb7b95b0744cdbfe7245645e6f0d2f4b039a2345 SHA-256: 4e10fcd9a3b342c31885117fbe0c6171b7e6b76c7505d07a2e5dc4a69e98894f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://protradingindia.net/userfiles/file/9412835553.pdf In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613376d6bc48f---segolasimodisomipaboda.pdfIn PDF document text
    • http://metallpress.info/files/vijobiru.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/nuzewupixozavutoxejazat.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nadazosanesusumulo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2d113f25---vudamozatapomal.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/55883427643.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/48200367577.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/83210977953.pdfIn PDF document text
    • http://bndweb.nl/upload/files/dekakevegirubidoximevalov.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161376dc1de6c3---40099584227.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136783d66efb---garawuvuletemopasutofuriv.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/57132494901.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/19188031929.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/kidukanufixolosuxek.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/bipivarizati.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/tizexasutu.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/85073143186.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8f8d9a96---lufebe.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134f039d0f45---pavozob.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/buwuvanorekisezevamiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+reading+comprehension+worksheets+grade+3PDF 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_off0000bbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 17300 bytes
SHA-256: eef87900218885663030762637d6bab322832dca82f9819a2fd315c501be4502
font_01_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 11244 bytes
SHA-256: 4e1abbbe68203efaa9ab9c2a3fbd6a7176373a4dd91a93eb5828797b7fbfe860
font_02_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1