Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72b6843e19aba9d…

MALICIOUS

PDF

82.5 KB Created: 2021-08-11 12:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 504e7a143eca21893c230ea7e1016f36 SHA-1: 232e6f03350c450a578d59ab7d85dfc4573befc3 SHA-256: f72b6843e19aba9d2a19e74b1a501564396dedab14fdbff4ea7dd8abe69524aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bilmatbasim.com/userfiles/file/dedufis.pdf In PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/gunekuk.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072fcda98cb2---16350779620.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/41208495035.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/63220259298.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/a3rmopppebq4fl7q8u2d1g83c0/jilebigenunuwodimojaj.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c36ed2ce6d87441b696e9b326b4c5991/20324377614.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ef8d7797bd0731681de3e44c86b4bd9d/42707459229.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/47601345181.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/186c14557c1f32ba30114d3c79c6b8ad/tidipomosinuwibevodinuz.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/14272216581.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/sivovalilonajenesure.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e0df7da025ca636bf4e1be0853cc5813/2452320641.pdfIn PDF document text
    • https://bio86.net/fichiers/jaguwovisaferar.pdfIn PDF document text
    • https://icbacademy.com/upload/files/65549820373.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090738b92daf---49382344294.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/35584914651.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/benuxodetevofaminawif.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/zubebinoporulezufija.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/kikewepijekaxug.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/84a062c06997fc5d3c89cb86199367e3/sepabolijofanovoriwam.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/pumoxekiguvifolalag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=slope+unblocked+unblocked+games+77PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3C 15180 bytes
SHA-256: 236a67cd39a145a25d05eb10c4bfbc95a09392c157cb9449e638a7abd22e184b
font_01_sfnt_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10452 bytes
SHA-256: 07c5919f2bafe00f96bfb5dfed55dfcecf35332f5255d6467ea327abd6027a95
font_03_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 11024 bytes
SHA-256: 034cb40c1906e73be630aec90ecdff2cfd342e3f0d9fc8a00dd0193794a1de75

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