Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d58e9e72343068…

MALICIOUS

PDF

80.3 KB Created: 2021-07-03 19:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4342d10044dbc45bf86557969cd87b46 SHA-1: 634bd6839c4c2a896afe91ef552270fc477f325c SHA-256: f1d58e9e72343068408869f5a32dfe9dcd0977e93b908adc0f3a12866a4d7b07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76212359f---62238557816.pdf In PDF document text
    • https://n-zvuk.ru/upload/file/65314131223.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079299a317b0---nadurevarezoji.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/vujekuxesotetelexavir.pdfIn PDF document text
    • http://charivne.info/images/file/21865958844.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085caf491b08---6987101037.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/o75snc6n9itl4ilkoh8fn4d1i9/dejugokatatodaw.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/murosogejudojot.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa1ddaf69d---fomeveko.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e353958b6---pajunigodas.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/7577307790.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/62396648321.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/wibaverakofewubesozujam.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/80477852403.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/74939479321.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/46191200059.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9db02638---kigoluxuwinad.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e56603682---jonoranoteb.pdfIn PDF document text
    • http://coumert.com/images/file/zoreritonu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/93669769425.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db53f47dd8---xujeledepolarodabik.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f913518526---43578323232.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6892b7a78b7898907318717ebcd1c585/nivoganizitiniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=it%27s+something+in+the+way+you+movePDF 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_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 16828 bytes
SHA-256: e4f929a3cfede050354c2e46f6380c36d3b1a646fad69b2a8c5cf4a5255cf0b9
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 10760 bytes
SHA-256: fd1dfd91288e42959663288ff16acc87c2709bfbecfa643b45e890d5c20b249e

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