Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6561cf6ee87f2f…

MALICIOUS

PDF

73.3 KB Created: 2021-08-27 22:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: add85d54644d1f91bd6d8f1e65874756 SHA-1: b0392c2178047cdf23f03624811e9c211a2be8d8 SHA-256: ed6561cf6ee87f2fb87c21ce4f90d12966cc9bd8e6fa48b1ae40e0d5ac60ebd2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=integrated+equation+for+first+order+reaction PDF link annotation
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2bd79e43ff042cb2a3b4d4ba8e21033a/66029639775.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/boxodigadivasutisafum.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/balatutezotoderovudad.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/59659960004.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cff96a32cda937b58e435a7b2367e0fc/sipujujovapozokugufaxaped.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b599d06a539---2734030657.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/rekili.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac045c2c1c2---kivanonupopevabisoli.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/zodogasezilavopasa.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/gakiditiwiturodefojasenug.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/pifajerivekak.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/14428531578.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/47727517167.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c8fa7d04---92319950044.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/bujeluwedewa.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/58771555927.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210724090047.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0j9qtcp2nn9v7c8p5ja0oum3l2/lawuvugi.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210821234523.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a205688d8---wasosavedep.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/jenowalutopobimatu.pdfIn PDF document text
    • http://unsersohn.ch/images/file/82301858512.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/19477359785.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/16851308945009ed36a4916bcfa83c91/sazokexoxujirimugevono.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_off0000b9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 17228 bytes
SHA-256: e8dc82e005a83b94d156c6db3a21b2d20109a1d02fe52fac5bd0a1793e23a183
font_01_sfnt_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 10800 bytes
SHA-256: 94e4dc83993d467e2af7b234e13fc1e1a58fbd3a17a51973757f9866c59fa36c

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