Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d1ee1ae5d8e074…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 05:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c881397921aed02d4cb07b759804b743 SHA-1: a21b6cf7ed26a722d4e6f0bc4c6bacec31a4dd20 SHA-256: 86d1ee1ae5d8e07492230d4ca0f8471bab45eeb042a8170df376f5744ab75dde
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URIs, many of which point to potentially malicious or compromised domains and an IP address. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://democv.associasuite.com/imagenes/contenidos/files/64508457502.pdf In PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/53326302072.pdfPDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a50c4ef62---kidujo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161401709ec79e---57055579575.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/desemofuvo.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/68463034765.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/xefokojitiwat.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3ad49a27---lowinire.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/gikevunagukowukewuwik.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/42032227511.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/19075302362.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/wuwosanilarolejikodobo.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/64796217422.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/tasaguzabokibamonilejazo.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/42705014167.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/2815866410.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/557605099.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/40301607544.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/kanororapazanajajiwepaga.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/jeliguk.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/95242680136.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/74704799827.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/tagiz.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/43663182874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=alcatel+one+touch+pc+suite+free+downloadPDF 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_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 18624 bytes
SHA-256: 9e4da1fa284f74e04028d33f6767e9740cdacdd74e3e53ad6e12908d017a714b
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 10884 bytes
SHA-256: e6ce66c545c68c93879ab476366b0a00223a7d53fe49fb85a8239d74aba57764

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