Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fd3ea482bdbb67…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 16:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 372731a28dc2b0c7bd096fb6d1c17722 SHA-1: 9df856ed002d10169535527c4da77fb514f45bae SHA-256: 24fd3ea482bdbb67515182950a06964ba9e5500fd698e026be6a68b2e4f3bd87
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, designed to redirect users to potentially malicious or phishing content. The primary attack pattern observed is the use of a link farm to direct users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://wastran.ru/uplcv?utm_term=benefits+of+cultural+diversity+in+the+workplace+pdf PDF link annotation
    • https://anandamsanyal.com/userfiles/file/80630621797.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bgud23pjkal7o9s4aehbqcp1u4/85830962265.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9aa1fb54ba96115010dc257316284b88/lovovotejasabiponir.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16132957749256---gobupun.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/ruxojijiwek.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8haqk9voa8kr8jlcsjs1r5h54/54867043652.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc7e0ca0e---widew.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/51ac8a67a0f22bce787f7b150230773e/vogitejuxigumejaxuxedi.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/wovusasewop.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/ridujezaleradomivapemom.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/32297713696.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/60386712378.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da68d887afb---weweberujozeduresu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/5259dcb1e35c3d460a80b27be8caed11/6001938318.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b92401b113---38792098055.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/40915976445.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/83598670283.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/hh1jochdp95n0sd0b21o3nm72f/denigowobometabanunigib.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/70734016559.pdfIn PDF document text
    • https://mmszke.hu/files/file/40778562120.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/lapukov.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/76599662212.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc494befbb8---vovijesijeralatenazibod.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/9059622671.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rn3c2nefchk5guvrk7b8tan4n2/zaboronifopupajikudejir.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/birojus.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_off0000bb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 15800 bytes
SHA-256: d34865dd77203450399b6d4ec44a9d3bee2350e4ef9c0b19b74cbd36f33e945a
font_02_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 11228 bytes
SHA-256: 2a08a0ceaca9d36c75c89be5f4f7be96afc766e9a4917532752298390ac8c24a

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