Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdb9092144a0526…

MALICIOUS

PDF

74.4 KB Created: 2021-08-27 23:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 061041b6eeb034e00f9f9a9b6723e097 SHA-1: 55e0d3c19dd1968c20d583186d886651cbf1cc84 SHA-256: 9fdb9092144a0526d0bac331c04a475c5d38f0790bd5812330e24ad9f6ef2d27
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites, specifically leveraging WordPress super-forms uploads, indicating a phishing or malware distribution attempt. The presence of these links suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/sb113pvdvliafmp9p58tieasik/13234154273.pdf In PDF document text
    • http://alfavit.tv/userfiles/file/kovowa.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/46e15f405a69ee9c597cab61181e2e70/85401527108.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/goworokalupadopisoj.pdfIn PDF document text
    • http://fitviewer.biz/files/file/lirofo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/zidibozukusomovaxufimape.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/zapisisusexoginu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/danujufodixowigezegejome.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/e0fkkn677asi03rgtosm1q0vjn/detikenok.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/xowax.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/53990256621.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/bogomezuki.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1625705146.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/lufubesivofidisamese.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/57562945554.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/tugejagiseterame.pdfIn PDF document text
    • http://ekotronic.eu/files/file/veloze.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qgdieslcdmj6cp98489a6g7ptm/12596459750.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/depotaleropu.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1tdcq2ukq0ovf83arpjafr65h8/gazojizalogizugez.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/56396100104.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106fa7a03fc8---41981147068.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/rosira.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/76650665737.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/ruzafidexerow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=states+that+need+to+be+quarantinedPDF 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_off0000bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 16864 bytes
SHA-256: 0f78ec4a4068d802a863f21c837738bcbc538cac4f6e0855b076f3214b464210
font_02_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 10760 bytes
SHA-256: 64e1821f63cef17799589f43a547ee74efb38b05c880da02e73b6e110c653925

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