Malicious PDF — malware analysis report

Static analysis result for SHA-256 39347f104ee7fb89…

MALICIOUS

PDF

88.8 KB Created: 2021-09-07 04:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd68139136cf6cb7c84d9a33c07276b0 SHA-1: 891d341a2d35212d10a4a578ea7878f5a0f10655 SHA-256: 39347f104ee7fb891d3b435627134e49377973a35fe4e36bc43a5067de93caf1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing or malware distribution sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/f7e1s93qbojabto3m7m7kdj800/41824883323.pdf In PDF document text
    • https://kozlovka.mebel18.com/uploads/files/jitaxoxibeb.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc7cb0e4c8---repunule.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/wozatagevesurixifijol.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/39739292571.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/vadolujolukasorom.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa3054d27---13771013851.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/05/68029346804.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/rozudok.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc84eb83e---98572767849.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/36607710963.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/85322974202.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e28578b8403e00c0db0f57c6c680b708/92206941285.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/45b323b6a900afbfa80ef5171f655f51/51588189641.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/luropulivuduva.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/22831735423.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202166134642579.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/94115837230.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/32317682432.pdfIn PDF document text
    • http://esistore.be/userfiles/file/mobodudomoruliziser.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/suvexejanupakaresawosojaf.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/5325480087.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02a7ed928---8570699894.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/suredivesobanejubajobu.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8ff3a3ec30f36a4a7a558075197a918d/70189968160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=segmentasi+dan+blastulasi+pdfPDF 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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10936 bytes
SHA-256: b4c391c25f026bdc18ab337f90b98dbebde5c1301558c4b5e9a1a98d4adb87c8
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 18544 bytes
SHA-256: a7b099af494c7b1475539f782a31580864e9c3567b4a9e40afc73738282d4542

Open this report in the interactive analyzer, or submit your own file for analysis.