Malicious PDF — malware analysis report

Static analysis result for SHA-256 42894e0d5f9e87eb…

MALICIOUS

PDF

61.6 KB Created: 2021-06-18 18:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ef6bd6eb064d57b1f62aed83b9b2cbc7 SHA-1: c89b9f184c20969becf1374bac05ed13d2fa8a44 SHA-256: 42894e0d5f9e87ebd6e69a848b57837cbba4c364996de015ea46e4ea1097ce18
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to appear as a search result or downloadable file to trick users into clicking on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 http://beijingxinzhi.com/userfiles/file/20210508170604_2095346615.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c0e396905---33538802539.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/lowet.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c2aa6738fd39179ee7905325159f224f/denenesajomitax.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e3887ba8---pinajavanuj.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/xumel.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/30703579618.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/29770935975.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f4a25c6d7f96174154c9e3b2099da663/60627958188.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/60318936240.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7abq2d9b35bq8555460ppt2b1e/rarad.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/tobefumefemigumewe.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/lewijunekebujimopusikofaz.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d641498b00d79c0c3bc6bd8bb4111d73/mesulawirugojazomez.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/wodefufomero.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4228a170c---watexopobimulokewij.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec3484749b---luzifegitimufir.pdfIn PDF document text
    • http://ruresept.ru/files/file/lonef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=believer+dj+songPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB513 4968 bytes
SHA-256: 674543fed5a2db9c3b306716e59dd697afadb919cd04cc502867855d2e16d7d1
font_01_sfnt_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 10336 bytes
SHA-256: 7db96f962080d4e67f25268ad6cf94fdb6b72378b805cb96758290fd7309f973

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