Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66e4039bf4c4428…

MALICIOUS

PDF

88.4 KB Created: 2021-07-22 14:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8486609b28ba8ca376947c0f0e93fbb SHA-1: 27a08c73ea0e0872032395cee64c029a7825c315 SHA-256: f66e4039bf4c4428ef3a1cfe055eafe18dfbae1d701a30ba01f86deb3b67ebda
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URIs and the nature of the link farm indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.vpn-solutions.com.pe/ckfinder/userfiles/files/48215749803.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c940c4f6a9---sexorifogiwewutupozajuzak.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/vodok.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/47600872190.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/zefawatuxedorimodedotudi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e636a0b9---kevisatejerexagewekipaxi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f90296e0---57642097269.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/67835312875.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc924e508---mojefusanomeromovisukat.pdfIn PDF document text
    • http://isgsrl.it/images/file/24774024705.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/jakenivegilipotutefenuli.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/0de41ddc2deac91ed73c315857a9fb01/mejabujiliseregagajidin.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/95d6fd20d1f7fda200c48dae63deb6ae/272745609.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/rokaz.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/pu10k1l0jl8500c6g2gst6u95m/56058305634.pdfIn PDF document text
    • http://roocenter.ru/upload/file/zijisebukade.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210624100705_wux5pp.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab4847491---40266920104.pdfIn PDF document text
    • https://cape-electronics.com/media/file/wewamaginufifaxe.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/tidemipuv.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/merogifozo.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/79715757232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=renault+duster+pdfPDF 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_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 10424 bytes
SHA-256: 85529b7df5560ff4833f31f8919465358a446ffd9694d3a3dde510243076ae9a
font_02_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 18652 bytes
SHA-256: 4f788e195c1a69eae7cdaa8418e120416f05b0ce13bfef44a5dc9191042a4e24

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