Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1252e23be3b0cee…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 10:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21fd4e32c0e29d941dae4e1b0f6e6200 SHA-1: 5890a9e5dc5f7cd1b2b7aaf9e55116c4f3df0abc SHA-256: a1252e23be3b0cee1e25b0c5b10c573ec00d0ce73ebc334b8803a01ff512bbac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous PDF files on compromised or disposable domains, likely to distribute malware or phishing content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://akproauto.net/nbloom/fckuploads/file/68448291739.pdf In PDF document text
    • https://mai-avto.ru/upload_files/file/94522800691.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/20992759119.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/dexilawoletilije.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413e6ec9ec3---90145181521.pdfIn PDF document text
    • http://stroi-sistema.ru/img/75164734080.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/90972567429.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/zuzibigesaso.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xonarepiteretoreropam.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb8130e03---7500728324.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/gogopalarozanozal.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/69878845266.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/tisezusuk.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/gikemodonigizom.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/pudopizarawisifuw.pdfIn PDF document text
    • http://salt17.com/userfiles/files/dukomitide.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/24412117768.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090120583373499.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/2751808095.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5638qiogp5v7l26pgv7hr30p61/nusisokalovobaxovupaz.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gogirosiweruz.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/85271407327.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/29684222242.pdfIn PDF document text
    • https://anakmeong.com/contents/files/gidokisazikeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+san+andreas+effects+mod+androidPDF 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_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 10628 bytes
SHA-256: 7b0d3d889d5997fb8f66ac0c13f87edf348366e5ac1ca2225dfda8ee0cf74cc0
font_01_sfnt_off0000c9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AD 15256 bytes
SHA-256: a5b29928e6af0476c97c63fb3e1dbb2c1548f812ea7562724bd74e7f770c68f5
font_02_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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