Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d9f90b199b5880…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 11:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 954ccca363e7cd7f80e0881ba80f5fa5 SHA-1: 93a045d9c89748bbc78e731d83367382450d343e SHA-256: d3d9f90b199b5880badd237443e4af284bde572b7d60ba60b01472569eab76dd
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is classified as malicious by ML models and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing sensitive recovery secrets or private keys. Numerous external URLs are present, many pointing to disposable hosting or compromised CMS upload directories, suggesting a distribution mechanism for phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://irlanc.ru/uplcv?utm_term=2nd+national+language+of+india PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021090119013614.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1502b012f---kovirawamoxavu.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/7034422292.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mucfd5kbrcfdvtq1ed0ukocphc/90315198079.pdfIn PDF document text
    • https://rjpexport.com/files/jekatalimo.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/zusegagowo.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210917003652.pdfIn PDF document text
    • http://agrion.org/upload/fichier/padimuwaridalexuledijew.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/tizekezakezofirolalibibo.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/wifagolinujujoputitinate.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/67046253418.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6389c53b---kelibexizupowoze.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/dd8223c28de8f58d69957b3b849caf45/47897332163.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/tododubeluxoni.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/somuwokerepovunajubarewim.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/54949097444.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/dutikal.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/dazofow.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16149cfa12fd98---zulodusabaxoluw.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/71906835203.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/zovixoroxiv.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/bugexujibod.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/27190255002.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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 18392 bytes
SHA-256: dd3a52e2e15efcbf613158460ce0aad35cb69e8e852f4701c5867aa034388438
font_01_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 10384 bytes
SHA-256: c4b403a8d9183a36c6528a6c4941bb67a19075088ac7040b3e4367247578d4dd
font_02_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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