Malicious PDF — malware analysis report

Static analysis result for SHA-256 11124ff8719d8b7b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 04:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a9a500d9ab49b9e0bbbc577d271e6c9 SHA-1: 51c8d3d5c8f0a82c53d25639b689e1ea83da0707 SHA-256: 11124ff8719d8b7bfd5921909a3aec45f69abecbf78e2544502589c582d60d92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=year+2+maths+problem+solving+worksheets+pdf PDF link annotation
    • http://seidels-mineralienwelt.de/images/uploaded/file/golelijifuvanodajid.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/678bea6fcd8c8d4628354cba8c0c3a55/fogasirumir.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/lalixora.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/31650823283.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0091c8a0---89680941102.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/xudefegoni.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/tazuj.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/40162510201.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/zivipipox.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/barolameriza.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/8456510425.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e612bd5306---69649734505.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/rofigemopopoluponube.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7a58ffae---87256370221.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985072a5f39---87635776177.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/saburuzosewivifegoladejep.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210628140404.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/rozorasefuladasuwugifur.pdfIn PDF document text
    • http://aps-mes.com/files/file/6039359141.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab52136b7---wevupolizuwirisigapike.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/41581194428.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/28059943879.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/35135904266.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/87791807112.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/26908289771.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d3a48c0da---65575242422.pdfIn 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://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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 11432 bytes
SHA-256: 5d655ab4a4818f88b6a8795460dfb0be7db6d33c99bd84f43bcc554109b5aafa
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 18080 bytes
SHA-256: 114be1c56a3004c091a576931d8c23e5565183fdd30238e6762edefa0992c400
font_02_sfnt_off00012789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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