Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bdc5b4c39c990f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-22 18:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 256dc74a657112b017435307875c56a5 SHA-1: 0d496eb972ae0dd1dce8a83e7657487dc447e638 SHA-256: f9bdc5b4c39c990f29292909fbbec010e287a49354062b4d225fc4e30091dccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or scamming. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=avatar+the+last+airbender+season+1+full+episodes PDF link annotation
    • http://poultech.net/d/files/sidizalexipato.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/nevewaja.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/lawuxasogivakojoka.pdfIn PDF document text
    • http://chapelguild.com/images/usr/81603414580.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161352e74a2060---xokeja.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0e90c54b8ace9a31986e48cf22881693/javowuvesepagak.pdfIn PDF document text
    • http://hueide.com/upload/files/11711700815.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/85998370235.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/fupufigajun.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/69041552620.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/52710593476.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/nemafadowol.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/28655026401.pdfIn PDF document text
    • https://esz.jp/img/editor/files/xugibudika.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/levota.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6020626461432687d2eca.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/57200632960.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1bc3a60c---mamamo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f97ecc6eb---pufuxizamasebexodudujazok.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/datekapun.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-18-18-03-25-9WCoaHEQ.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/77547544858.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_off0000bf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 10936 bytes
SHA-256: a6bde36bad98954d96ac0127ef2e5e14fa0286308c7f459bdbe9711503b69f5e
font_02_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 16256 bytes
SHA-256: b9be2fed2d9ac6575e41da43d47ae647cb6e67b015976a074f40bb3c3bc30956