Malicious PDF — malware analysis report

Static analysis result for SHA-256 318556b7e3966382…

MALICIOUS

PDF

89.2 KB Created: 2021-09-16 06:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4260da108d1b89ef294d3358bad0546 SHA-1: d75a6c9174d6c2a436a0f45f90e9d6ae35a5c46a SHA-256: 318556b7e3966382f5ccb2e99d4a2983f79b5db03b5ef599a927ba3f876d4d10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b48a0f6e3---zotujag.pdf In PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vabozezeduxudusigopuwa.pdfIn PDF document text
    • http://irinabailey.com/upload/files/sorifatukulebom.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac1ac4952---nomoluwamujesaxe.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/vipupuvisojiwenulolatu.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/zabasinil.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/53475445538.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/nabibuliwifu.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/jazonatixowomunizozikosu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cfce23f203ad7ef0fea87c726965ce89/pusiz.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/19583586780.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/wosivejekugilakovinikodi.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/damevozapaxuk.pdfIn PDF document text
    • http://novafish.it/userfiles/files/zivokoton.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/vugagogojixerazemunu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55edb29e4---luxekovojipem.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/94119514989.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/30060412234.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9e8f4006741c2bb5b6d4d3ec1ecd5804/juluxevazefuxilubuwibige.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/83033259550.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161375412af1fd---2115651271.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/rukariwabudikapimoseju.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/2821943063.pdfIn PDF document text
    • http://villanakarin.com/userfiles/files/14655872209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mnf+stream+freePDF 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_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 10108 bytes
SHA-256: 9408f2ee3a1054e0be6bafec68a7952ba060a9266c26bf9eb1da0fc3e7fce5ed
font_01_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 18524 bytes
SHA-256: 47b29bf0623da44f8fdde2291ffc1e0fe528d24d1367e98c8962498be6041e5e
font_02_sfnt_off00013f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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