Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ec49d7514ff1c6…

MALICIOUS

PDF

92.9 KB Created: 2021-09-21 04:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b43a039381450247e7bfd68d200e8007 SHA-1: 70458d91016aada91ca0a52a3dc87016c46fdab5 SHA-256: f2ec49d7514ff1c6c3550e6e82a38d655ca3b0e9515839abdc1dacf7a9656d78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the presence of a link farm and the high confidence detection scores suggest the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=putlockers+movie+free+2020 PDF link annotation
    • http://novelinternationalschool.com/ckfinder/userfiles/files/satatomupofo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161440d7a0b049---28950575310.pdfIn PDF document text
    • https://olterus.com/contents/files/50469664697.pdfIn PDF document text
    • http://horvathortho.hu/tmp/jijenafilawekud.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/68905077519.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/34745197724.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/50259378824.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161345f748505d---57771183169.pdfIn PDF document text
    • http://esejsc.com/upload/files/dawuzinapizes.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/pamutaluvanunexudatefejew.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613525d92999e---68173412671.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/27599043207.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/8908702403.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/20800501441.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/71028928511.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905160727.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/37521841663.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/jasutimivamovun.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/49085913270.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/32257610658.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/19920526576.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/75143757732.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/26005487551.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/34074726634.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_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 17228 bytes
SHA-256: 054e15310867f1eb04cec070fb3ed1bb86260c5cd997b1bbd0cb2b03c371eda7
font_01_sfnt_off0001364c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E63 10732 bytes
SHA-256: 20ef25d1abfe5ccaa29e3cafa48c8310be423790e57d62f9fe852f415283d89b