Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45f3df62e2af92b…

MALICIOUS

PDF

124.9 KB Created: 2021-07-30 11:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8112e49e2ac27e5579ddbe626c877b08 SHA-1: 8d73d38b1f1b8e5a963b6f485fa5809f3effacc8 SHA-256: a45f3df62e2af92bbe6cdc95a056afa0e8417549d5b2887fe1c1bf1dfd084056
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e05aead0d---98929711046.pdf, are likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7a7bec1411649e17ca9b499d2bb37c17/mugoxekarugenupobiniduda.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/n0utptrl61uvb9gi814kqgrl13/sozisilolutumofawit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a775061eefd---wawaguzixabinonom.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/safomusufojexafuwo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160877ceef23e3---10098907162.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1152a28982---20584916897.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b50a1ed49---gaxidapetamivowezo.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/29465762062.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c842d2691---57207193948.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e846ec97989---bilifidesupiluvubuji.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/12444091106.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/37977221612.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/91696403127.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e05aead0d---98929711046.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/zezogifemisebilenuxezan.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/da7ad4g6qeouf8bfjth7mjlbev/remag.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/64173262590.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5e132103254f7d14630f3db71b1fd542/zomusogosirup.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/dipixoma.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781992dd49---50482320924.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/98202784717.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/qe9asjdtc9lmkn8tf0imn6k7cv/77830745861.pdfIn PDF document text
    • https://sambelteri.com/contents//files/xeduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+reset+rainbird+controller+passwordPDF 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_off00017f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F0C 21232 bytes
SHA-256: 5acfe2c30e91d53ca4fe78614815e2a24ddd0fed3f190ba484fa91b60d78461c
font_01_sfnt_off0001b43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B43F 10724 bytes
SHA-256: e7ea0c1537f55816280d555416054285ea871ec0a763c458b3f8175cf20666a9
font_02_sfnt_off0001cccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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