Malicious PDF — malware analysis report

Static analysis result for SHA-256 712dc3de0486972a…

MALICIOUS

PDF

124.8 KB Created: 2021-07-03 04:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 49eec1d3558ae4bcc3a5dc0b168e1586 SHA-1: d5c79ff583c8d50a68bd667d9cb41b294254c5e9 SHA-256: 712dc3de0486972a2d336f511c46fd3d26f1900aa1c080436f33f4bffba12cfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it functions as a link farm to distribute malware or conduct phishing attacks. The presence of external URIs and link farms on potentially compromised CMS uploads points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967b2ac27a9---fusefifure.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/sagudajexevidig.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/93982211837.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/40251994705.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2ltt24m0hv1av60bidaol27bd3/vexuzewaxesuzoxunim.pdfIn PDF document text
    • http://yuha.be/_files/file/jamap.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5727982e967e16db887c708917f7841c/fikafufubidimus.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a514699dbc599b316541f974898628d1/48103795178.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/70058950805.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/i80tg3dlgmaspro9g00uuid7r1/69629247385.pdfIn PDF document text
    • https://tmtteks.com/files/zokawowon.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/4344737460.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/63563255210.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/52014147148.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/784204117.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ecd9883317c20eb55bb5097d527e02e7/kitipojaxogiw.pdfIn PDF document text
    • http://flexa.cz/docs/file/59831664254.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/61448757095.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/15b7192027a609f20857b2e71d126bd2/diletikezosuwab.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s67uq1ah0gimikih8kn5pb51s4/15054917242.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2dd8fe46d049e97c5f1943671b581d8b/sevedeligatejebexuk.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/sisanurituxefunotuxojeb.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607426ec3dcc4---bupamilowutup.pdfIn PDF document text
    • http://www.celso.org/download/lawiwopexexagogeluzogofum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=crash+course+great+depression+answersPDF 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_off000183f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C06 18336 bytes
SHA-256: e1d036d6e2351ba99185d246ffb16de3fb601e61cc128d79e30adfeb63d528c3
font_02_sfnt_off0001cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC7A 10964 bytes
SHA-256: 56e7168baa3b0fad3427c8c84be3f85c9b63315ea7aaa7ecc715930ed9bf5ba0

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