Malicious PDF — malware analysis report

Static analysis result for SHA-256 20302ce1d39eac24…

MALICIOUS

PDF

81.1 KB Created: 2021-06-08 14:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 04a0d64c090ad01cd908c243c2fe5b86 SHA-1: dec02434de290aba00e73c0237794b1aeddb75bc SHA-256: 20302ce1d39eac249bf09a599fa5fa5edb4842079538337032684d7a2bbff767
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The document body, though partially garbled, suggests a lure related to children's computer activities, aiming to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=actividades+de+computacion+para+ni%25C3%25B1os+para+imprimir PDF link annotation
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/803a9ca082f387ed645f1349076582bd/28775988047.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc5d66e87---6513084936.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/61578752859.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b801e7ade09---19250581556.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/gegava.pdfIn PDF document text
    • https://noddy.nu/images/file/diguselagijepabokibin.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e727c52290---92512382935.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dekulbaufffbc5digql6av3r24/lujosututeja.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2baf80c03---zalogipivurusete.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33ce7dff9---meledejoke.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1a574468008c6004726a34e370d7c18b/30356186409.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020754bfa4---83222924654.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/o552fgo1d5qkgvkep52fmmvfcg/nasuvofobedenibunadipebez.pdfIn PDF document text
    • https://altbuket.ru/files/78352119688.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/78329831754.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/sevolivoduropowune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 5332 bytes
SHA-256: 1f7d0feb5dd5f12244e3022a0457496f85c8cbd0d7cc992e8bf7b99fb89feb22
font_01_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 12072 bytes
SHA-256: a3a1507f45e6843362326b95453930d3a01dbfa298df2ae6f156864c4800079e
font_02_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378