Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c24e8bd795840b…

MALICIOUS

PDF

74.4 KB Created: 2021-06-13 01:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d9990bbfec449bb7aa945932a232c5b9 SHA-1: 8d0bd2aa64f2b01cc95a9487c8539a5b9d2b61c6 SHA-256: 57c24e8bd795840b931b7423ea73d5f7fac3da12eba98787cb53f9c58d903e2a
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'javascript print base64 pdf' in the document body and the PDF_URI heuristic indicate potential JavaScript execution for payload delivery or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://garglob.ru/uplcv?utm_term=javascript+print+base64+pdf PDF link annotation
    • http://exmar.it/foto_fck/file/79123107368.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/59929760206.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/1crt9bb4ipo2vsbjcmd0ibt88b/ribetafepigazaseveka.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/7a55e0beb845ce5e3d5ec83ba22fa194/zitilewif.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3e42815ac3ced870e0710a598c8e1517/rikupudumukefejep.pdfIn PDF document text
    • http://metapolar.hu/tmp/23674370535.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5d32c0f5539725dd04a9bbacbec84f59/5768418029.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991898b8131---fipudeloxow.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/76895595739.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/127jejv8qtvd5j9rs45v62u22a/50157277823.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a6f3b6182f0e6b3a29cfed180080fa58/59402307059.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/6443a880136d5210811a05a4e20d8e52/mevitedavirixijo.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/lixad.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/senoxuruvenexule.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/96874374285.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/kemanadepamuru.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097c5724266b---26680035049.pdfIn PDF document text
    • https://www.prestigeautoIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 5548 bytes
SHA-256: 6b150558e565974799d0479d7b228bcd22892bf524673a92c7adfdb2aeafbfe2
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 10608 bytes
SHA-256: 3654455fa3d9f2d9658dff197396d7dd270a23ad43d5977d8a79d1835ef08972

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